Webpack all the things! Fixes #2135

This significantly speeds up loading of the application; in an average of 3 tests, v1.6
loaded in 11.5s in the runtime on a Mac, whilst the webpacked version of the code
loaded in 5.53s.

web/pgadmin/static/css/bootstrap.overrides.css

@@ -1321,3 +1321,17 @@ body {
 .pg-panel-depends-container table {
     font-size: 12px !important;
 }
+
+.backgrid tr th button {
+  background: none;
+  border: none;
+  color: #fff;
+  padding: 0;
+}
+
+/* Latest backgrid adds column name like `label` to td element, override color*/
+.backgrid td.label {
+  color: #333;
+  font-size: 14px;
+  font-weight: normal;
+}

web/pgadmin/static/css/codemirror.overrides.css

@@ -68,4 +68,8 @@
   width: 100%;
   padding-left: 5px;
   position: absolute;
+}
+
+.CodeMirror-gutters {
+  z-index: 2;
 }

web/pgadmin/static/css/webcabin.overrides.css

@@ -95,16 +95,16 @@
 }
 
 .wcFrameEdgeH {
-  height: 4px;
+  height: 6px;
 }
 
 .wcFrameEdgeV {
-  width: 4px;
+  width: 6px;
 }
 .wcFrameCornerNW,
 .wcFrameCornerNE {
-  height: 4px;
-  width: 4px;
+  height: 6px;
+  width: 6px;
 }
 
 .wcSplitterBar {
@@ -336,6 +336,7 @@ ul.dropdown-menu > li.menu-item > a > i.wcTabIcon {
 
 span.fa.fa-arrow-left, .fa-arrow-right {
   margin-top: 4px;
+  width: 14px;
 }
 
 .wcMenuSubMenu {
@@ -382,3 +383,7 @@ i.wcTabIcon {
   width: auto !important;
   max-width: 100%;
 }
+
+.wcFrameTitleBar.wcTabTop .wcFrameButtonBar {
+  right: 30px !important;
+}