LibUtilExt/Extension: Increase robustness for yielded extensions throwing an exception.
ObjectTraits: KeyFrameAnimationTrait added; bugfixes.
ObjectTraits: ActionPerformerTrait added.
ObjectTraits/Helper/NodeSensorTrait added.
ObjectTraits: Cleanups...
RendRayCaster: queryIntersection supports multiple root nodes.
ObjectTraits/RayCastSensorTrait added; ...
LibGUIExt: generic PROPERTIES support added.
ObjectExplorer and ObjectTraits: update gui.