Silly PR. Some colliders added to cool demo
Merge pull request #661 from jtorrente/silly

Silly PR. Some colliders added to cool demo
Added FocusItem and FocusItemList.
DropIntoArray action and test.
Added FrameWidget.
Added FramesTimeline.
Added FramesTimelineTest.
Added description to Frame#time .
Added StretchableButton, you can change it size by dragging.
Comments addressed.
Adjusted EditorGameAssets#resolve and test fix.
Merge pull request #667 from gorco/StrButton

Added StretchableButton.
Merge pull request #663 from RotaruDan/FramesTimeline

Frames timeline
Selection object, to control different contexts and selections
SelectionCommand and SelectionEvent relies in new selection object
Added selection object to model
Selection test
Updates after API change
Updates tests after API change
SceneView uses selection contexts