Issue #185: Clean up WidgetTemplateSkin transitions.

* Consolidate effect + targets.

* Fade min/close button group when minimized.

* Use s:Resize for WidgetTemplateSkin transitions.

* Remove unnecessary fade effect.
Issue #185: Improve perceived speed of widget template transitions.
Merge branch '#185/speed-up-widget-template-transitions' into develop
Issue #183: Support selecting/deselecting all data extract layers.
Enable button mode on clear button for consistency.
Make DataExtract widget slightly lighter by using ArrayList instead of ArrayCollection.
Merge branch '#183/support-toggling-all-data-extract-layers' into develop