add change-algorithm example
* bugfix in LayoutContainer, should invalidate parent when child-algorithm changes
* bugfix in RelativeAlgorithm, bottom and top properties where changing width instead of height
* bugfix in UIElementStyle, changed children of the parent-style should also affect the styles of the grand-children etc.
bugfix in SliderBase after changing RelativeAlgorithm:
DragBtn would dissapear after a drag..
bugfix in FollowObjectBehaviour after fixing RelativeLayout
remove unused code from Slider
use layout.outerBounds for the size of scrollRect instead of "rect"
* add IntRectangle.containsPoint
* MouseScrollBehaviours will now activate scrolling when the behaviour is created and the mouse is already on the target
* bugfixes in MouseMoveScrollBehaviour
* bugfix in ClippedLayoutBehaviour
* bugfix in ScrollEffectInstance
* bugfix found by Eze in SliderBase
small changes in scrollable layout behaviours so they will only remove a scrollrect when the behaviour has created it
bugfix in LayoutContainer: set explicitProperties for children with percentage-size
bugfix in SliderBase
bugfix in slowmotion effects.. listens now to shift key up/down
Merge branch 'haxe3' of github.com:touch/PrimeVC into haxe3

Conflicts:
	src/primevc/gui/components/SliderBase.hx
bugfix in LangMacro