CORE-4193: Ground work laid for Integration of Tree selector
Attempts were made to ensure that the UI design is self-consistent. So,
there should be clear, non-conflicting class names, etc.
Removed dependency to ui-metadata module.
CORE-4193 User now able to drag new Hierarchical List Selectors
* This commit is removing the current list selectors from the UI. These
will be re-added as work on this issue progresses.
CORE-4193: Tree selector editor now displays in property editor
The widget displays, and should be data bound, but edits do not make it
to the center panel yet.
core-4333 refactor code
Merge branch 'master' into STABLE