Refactor JavaScript custom variant handling for sub widgets

Use _getSubWidgets function instead overwriting add/removeState in
Combo, ExpandItem, Calendar, Group and separator.
Other small refactorings and formatting. 

Change-Id: I4511279ac38cb91cbf2cf536e0c196665fc269b6
Signed-off-by: Ivan Furnadjiev <ivan@eclipsesource.com>
8 files changed
tree: f6b4cb3ba65f7d48718ca8484122686547f1c0ee
  1. bundles/
  2. examples/
  3. features/
  4. releng/
  5. tests/
  6. .gitignore