[Frontend] Merge work in open279 into open199

open #199
open #279
Integrated inspector changes from open279 into
new edit mode work from open199; _layout.scss
had a bit of difficult conflict resolution but seems
good at this point...

platform/commonUI/themes/espresso/res/sass/_constants.scss

@@ -171,7 +171,7 @@ $scrollbarTrackShdw: rgba(#000, 0.7) 0 1px 5px;
 // Splitter
 $splitterD: 25px; // splitterD and HandleD should both be odd, or even
 $splitterHandleD: 1px;
-$colorSplitterBg: pullForward($colorBodyBg, 5%);
+$colorSplitterBg: rgba(#fff, 0.1); //pullForward($colorBodyBg, 5%);
 $splitterShdw: rgba(black, 0.4) 0 0 3px;
 $splitterEndCr: none;
 $colorSplitterHover: pullForward($colorBodyBg, 15%);