make prime haxe3 compatible
* bugfix in UIElementStyle: didn't notify changes to styleNames when the target isn't on the stage
* stop using IUIElementStyle
bugfix with unsetting css-property "overflow"
* add debugbar in UIWindow
* bugfix with removing overflow-behaviour
* bugfix in ScrollBehaviourBase
small skin changes
small changes
make anchorscaleeffect compile again
Fix Effect.hx not setting Easing property during CSS parsing.
merge
Merge branch 'develop' into haxe3
* bugfix in ButtonLabelSkin
* implement better measuring for RelativeAlgorithm
better error message on wire assert
Merge branch 'haxe3' of github.com:touch/PrimeVC into haxe3

Conflicts:
	src/primevc/core/traits/Invalidatable.hx
Merge branch 'haxe3' of github.com:touch/PrimeVC into haxe3
toggle debugbar with escape key (tnx Eze)