Introduce nvim namespace: Fix unmasked strings.h issue.

Problem:  Now that nvim/strings.h is correctly namespaced, an issue
          that had been masked until now arises:

          When compiling, we get a lot of errors because of everywhere
          the functions in nvim/strings.h are used, there's no include
          to import them.

          But, how could this compile and work previously, then? It
          turns out that:
          - In every such case, we are also including vim.h, which in
            turn includes os_unix_defs.h.
          - os_unix_defs.h includes <string.h> and also <strings.h> in
            some systems (e.g. OSX).
          - Build had been modified previously to (even when importing
            system headers), prefer equally-named local ones. That was
            in fact done as a previous attempt to solve the same issue
            we are trying to solve another way now.

          So, we were including our "strings.h" as a side-effect of
          including <strings.h> through "vim.h" --> "os_unix_defs.h".

Solution: Correctly include "nvim/strings.h" in every file needing it.

src/nvim/buffer.c

@@ -60,6 +60,7 @@
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
 #include "nvim/spell.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"

src/nvim/charset.c

@@ -18,6 +18,7 @@
 #include "nvim/garray.h"
 #include "nvim/move.h"
 #include "nvim/os_unix.h"
+#include "nvim/strings.h"
 
 static int win_chartabsize(win_T *wp, char_u *p, colnr_T col);
 

src/nvim/crypt.c

@@ -17,6 +17,7 @@
 #include "nvim/ex_getln.h"
 #include "nvim/message.h"
 #include "nvim/option.h"
+#include "nvim/strings.h"
 
 static void make_crc_tab(void);
 

src/nvim/cursor_shape.c

@@ -3,6 +3,7 @@
 #include "nvim/misc2.h"
 #include "nvim/ex_getln.h"
 #include "nvim/charset.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 
 /*

src/nvim/diff.c

@@ -23,6 +23,7 @@
 #include "nvim/option.h"
 #include "nvim/path.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 #include "nvim/undo.h"
 #include "nvim/window.h"
 #include "nvim/os/os.h"

src/nvim/digraph.c

@@ -16,6 +16,7 @@
 #include "nvim/garray.h"
 #include "nvim/normal.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 #include "nvim/ui.h"
 
 typedef int result_T;

src/nvim/edit.c

@@ -45,6 +45,7 @@
 #include "nvim/screen.h"
 #include "nvim/search.h"
 #include "nvim/spell.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/tag.h"
 #include "nvim/term.h"

src/nvim/eval.c

@@ -54,6 +54,7 @@
 #include "nvim/search.h"
 #include "nvim/sha256.h"
 #include "nvim/spell.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/tag.h"
 #include "nvim/term.h"

src/nvim/ex_cmds.c

@@ -51,6 +51,7 @@
 #include "nvim/screen.h"
 #include "nvim/search.h"
 #include "nvim/spell.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/tag.h"
 #include "nvim/term.h"

src/nvim/ex_cmds2.c

@@ -39,6 +39,7 @@
 #include "nvim/quickfix.h"
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 #include "nvim/term.h"
 #include "nvim/undo.h"
 #include "nvim/window.h"

src/nvim/ex_docmd.c

@@ -54,6 +54,7 @@
 #include "nvim/screen.h"
 #include "nvim/search.h"
 #include "nvim/spell.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/tag.h"
 #include "nvim/term.h"

src/nvim/ex_eval.c

@@ -20,6 +20,7 @@
 #include "nvim/misc2.h"
 #include "nvim/memory.h"
 #include "nvim/regexp.h"
+#include "nvim/strings.h"
 
 
 static void free_msglist(struct msglist *l);

src/nvim/ex_getln.c

@@ -49,6 +49,7 @@
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
 #include "nvim/search.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/tag.h"
 #include "nvim/term.h"

src/nvim/farsi.c

@@ -15,6 +15,7 @@
 #include "nvim/misc1.h"
 #include "nvim/misc2.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 #include "nvim/vim.h"
 
 

src/nvim/file_search.c

@@ -56,6 +56,7 @@
 #include "nvim/misc2.h"
 #include "nvim/os_unix.h"
 #include "nvim/path.h"
+#include "nvim/strings.h"
 #include "nvim/tag.h"
 #include "nvim/ui.h"
 #include "nvim/window.h"

src/nvim/fileio.c

@@ -45,6 +45,7 @@
 #include "nvim/screen.h"
 #include "nvim/search.h"
 #include "nvim/sha256.h"
+#include "nvim/strings.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"
 #include "nvim/undo.h"

src/nvim/fold.c

@@ -30,6 +30,7 @@
 #include "nvim/move.h"
 #include "nvim/option.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/undo.h"
 

src/nvim/garray.c

@@ -10,6 +10,7 @@
 #include "nvim/memory.h"
 #include "nvim/path.h"
 #include "nvim/garray.h"
+#include "nvim/strings.h"
 
 // #include "nvim/globals.h"
 #include "nvim/memline.h"

src/nvim/getchar.c

@@ -40,6 +40,7 @@
 #include "nvim/option.h"
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"
 #include "nvim/undo.h"

src/nvim/hardcopy.c

@@ -31,6 +31,7 @@
 #include "nvim/option.h"
 #include "nvim/path.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"

src/nvim/if_cscope.c

@@ -20,6 +20,7 @@
 #include "nvim/os/time.h"
 #include "nvim/path.h"
 #include "nvim/quickfix.h"
+#include "nvim/strings.h"
 #include "nvim/tag.h"
 #include "nvim/ui.h"
 #include "nvim/window.h"

src/nvim/indent.c

@@ -8,6 +8,7 @@
 #include "nvim/option.h"
 #include "nvim/regexp.h"
 #include "nvim/search.h"
+#include "nvim/strings.h"
 #include "nvim/undo.h"
 
 static int lisp_match(char_u *p);

src/nvim/indent_c.c

@@ -9,6 +9,7 @@
 #include "nvim/misc2.h"
 #include "nvim/option.h"
 #include "nvim/search.h"
+#include "nvim/strings.h"
 
 
 static char_u   *skip_string(char_u *p);

src/nvim/main.c

@@ -43,6 +43,7 @@
 #include "nvim/path.h"
 #include "nvim/quickfix.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"

src/nvim/mark.c

@@ -32,6 +32,7 @@
 #include "nvim/path.h"
 #include "nvim/quickfix.h"
 #include "nvim/search.h"
+#include "nvim/strings.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"
 #include "nvim/os/os.h"

src/nvim/mbyte.c

@@ -91,6 +91,7 @@
 #include "nvim/option.h"
 #include "nvim/screen.h"
 #include "nvim/spell.h"
+#include "nvim/strings.h"
 #include "nvim/ui.h"
 #include "nvim/os/os.h"
 

src/nvim/memline.c

@@ -64,6 +64,7 @@
 #include "nvim/screen.h"
 #include "nvim/sha256.h"
 #include "nvim/spell.h"
+#include "nvim/strings.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"
 #include "nvim/undo.h"

src/nvim/menu.c

@@ -25,6 +25,7 @@
 #include "nvim/misc2.h"
 #include "nvim/keymap.h"
 #include "nvim/garray.h"
+#include "nvim/strings.h"
 #include "nvim/term.h"
 
 

src/nvim/message.c

@@ -31,6 +31,7 @@
 #include "nvim/option.h"
 #include "nvim/normal.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"
 #include "nvim/os/os.h"

src/nvim/misc1.c

@@ -43,6 +43,7 @@
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
 #include "nvim/search.h"
+#include "nvim/strings.h"
 #include "nvim/tag.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"

src/nvim/misc2.c

@@ -43,6 +43,7 @@
 #include "nvim/screen.h"
 #include "nvim/search.h"
 #include "nvim/spell.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/tag.h"
 #include "nvim/term.h"

src/nvim/move.c

@@ -28,6 +28,7 @@
 #include "nvim/misc2.h"
 #include "nvim/popupmnu.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 
 static void comp_botline(win_T *wp);
 static void redraw_for_cursorline(win_T *wp);

src/nvim/normal.c

@@ -47,6 +47,7 @@
 #include "nvim/screen.h"
 #include "nvim/search.h"
 #include "nvim/spell.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/tag.h"
 #include "nvim/term.h"

src/nvim/ops.c

@@ -38,6 +38,7 @@
 #include "nvim/path.h"
 #include "nvim/screen.h"
 #include "nvim/search.h"
+#include "nvim/strings.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"
 #include "nvim/undo.h"

src/nvim/option.c

@@ -69,6 +69,7 @@
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
 #include "nvim/spell.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"

src/nvim/os/env.c

@@ -4,6 +4,7 @@
 
 #include "nvim/os/os.h"
 #include "nvim/misc2.h"
+#include "nvim/strings.h"
 
 #ifdef HAVE__NSGETENVIRON
 #include <crt_externs.h>

src/nvim/os/fs.c

@@ -6,6 +6,7 @@
 #include "nvim/misc1.h"
 #include "nvim/misc2.h"
 #include "nvim/path.h"
+#include "nvim/strings.h"
 
 static bool is_executable(const char_u *name);
 static bool is_executable_in_path(const char_u *name);

src/nvim/os/shell.c

@@ -17,6 +17,7 @@
 #include "nvim/memline.h"
 #include "nvim/option_defs.h"
 #include "nvim/charset.h"
+#include "nvim/strings.h"
 
 #define BUFFER_LENGTH 1024
 

src/nvim/os/users.c

@@ -5,6 +5,7 @@
 #include "nvim/os/os.h"
 #include "nvim/garray.h"
 #include "nvim/misc2.h"
+#include "nvim/strings.h"
 #ifdef HAVE_PWD_H
 # include <pwd.h>
 #endif

src/nvim/os_unix.c

@@ -45,6 +45,7 @@
 #include "nvim/garray.h"
 #include "nvim/path.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"

src/nvim/path.c

@@ -22,6 +22,7 @@
 #include "nvim/quickfix.h"
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 #include "nvim/tag.h"
 #include "nvim/types.h"
 #include "nvim/ui.h"

src/nvim/popupmnu.c

@@ -12,6 +12,7 @@
 #include "nvim/option.h"
 #include "nvim/screen.h"
 #include "nvim/search.h"
+#include "nvim/strings.h"
 #include "nvim/window.h"
 
 static pumitem_T *pum_array = NULL; // items of displayed pum

src/nvim/quickfix.c

@@ -40,6 +40,7 @@
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
 #include "nvim/search.h"
+#include "nvim/strings.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"
 #include "nvim/window.h"

src/nvim/regexp.c

@@ -57,6 +57,7 @@
 #include "nvim/misc1.h"
 #include "nvim/misc2.h"
 #include "nvim/garray.h"
+#include "nvim/strings.h"
 
 #ifdef REGEXP_DEBUG
 /* show/save debugging data when BT engine is used */

src/nvim/screen.c

@@ -120,6 +120,7 @@
 #include "nvim/regexp.h"
 #include "nvim/search.h"
 #include "nvim/spell.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"

src/nvim/search.c

@@ -38,6 +38,7 @@
 #include "nvim/path.h"
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"
 #include "nvim/window.h"

src/nvim/spell.c

@@ -313,6 +313,7 @@
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
 #include "nvim/search.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"

src/nvim/syntax.c

@@ -36,6 +36,7 @@
 #include "nvim/path.h"
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"
 #include "nvim/os/os.h"

src/nvim/tag.c

@@ -41,6 +41,7 @@
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
 #include "nvim/search.h"
+#include "nvim/strings.h"
 #include "nvim/term.h"
 #include "nvim/ui.h"
 #include "nvim/window.h"

src/nvim/term.c

@@ -44,6 +44,7 @@
 #include "nvim/os_unix.h"
 #include "nvim/popupmnu.h"
 #include "nvim/screen.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/ui.h"
 #include "nvim/window.h"

src/nvim/undo.c

@@ -102,6 +102,7 @@
 #include "nvim/quickfix.h"
 #include "nvim/screen.h"
 #include "nvim/sha256.h"
+#include "nvim/strings.h"
 #include "nvim/os/os.h"
 #include "nvim/os/time.h"
 

src/nvim/version.c

@@ -17,7 +17,7 @@
 #include "nvim/message.h"
 #include "nvim/misc2.h"
 #include "nvim/screen.h"
-
+#include "nvim/strings.h"
 #include "nvim/version_defs.h"
 
 char *Version = VIM_VERSION_SHORT;

src/nvim/window.c

@@ -41,6 +41,7 @@
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
 #include "nvim/search.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/term.h"
 #include "nvim/undo.h"