collection bar for KeysElement
Merge branch 'develop-SN' into develop-JK

Conflicts:
	traits/src/net/pureal/traits/graphics/Composed.kt
fixed test + app
Merge remote-tracking branch 'origin/develop-MW' into develop-JK

Conflicts:
	traits/src/net/pureal/traits/graphics/Composed.kt
	traits/src/net/pureal/traits/graphics/ObservableIterable.kt
	traits/src/net/pureal/traits/interaction/Clickable.kt