Restructure the src directory

It is split into
- /libgnucash (for the non-gui bits)
- /gnucash (for the gui)
- /common (misc source files used by both)
- /bindings (currently only holds python bindings)

This is the first step in restructuring the code. It will need much
more fine tuning later on.

libgnucash/engine/test-core/CMakeLists.txt

@@ -0,0 +1,20 @@
+
+
+SET(libgncmod_test_engine_SOURCES
+  gncmod-test-engine.c test-engine-stuff.cpp
+)
+
+ADD_LIBRARY(gncmod-test-engine STATIC ${libgncmod_test_engine_SOURCES})
+
+TARGET_INCLUDE_DIRECTORIES(gncmod-test-engine PRIVATE
+  ${CMAKE_PREFIX_PATH}/include
+  ${GMODULE_INCLUDE_DIRS}
+  ${CMAKE_SOURCE_DIR}/libgnucash/gnc-module
+  ${CMAKE_BINARY_DIR}/common # for config.h
+  ${CMAKE_SOURCE_DIR}/common
+  ${CMAKE_SOURCE_DIR}/libgnucash/engine
+  ${CMAKE_SOURCE_DIR}/common/test-core
+)
+
+SET_DIST_LIST(engine_test_core_DIST CMakeLists.txt Makefile.am ${libgncmod_test_engine_SOURCES}
+        test-engine-stuff.h test-engine-strings.h)