CMS-2150 Re-design drag'n drop helper box
- introduce draghelper object
- misc css refactoring
CMS-2150 Re-design drag'n drop helper box
- Move update drag status icon to DragHelper
CMS-2150 Re-design drag'n drop helper box
- Transform helper when dropping is allowed
Remove unused code
CMS-2145: Select empty component after it has been dropped from context window
- Fix issue where the auto select after drop misaligned the highlighter