Add collision groups
Merge commit 'd68910b81647f49f7f288d8253685c0aef52cb11'
Use engine collision groups
Notify position updates
Merge commit '08e23aa6696d12a0247cc71f696a9c8bf03cedd8'
Add lose state
Disable collision detection debug drawing
Fix removing signal handles on leave
Merge commit '386928a1e988a203159363f457cfc8ebc61cd039'