For now: MarkSurroundingBoundsDirty
Add ModelEntity.EnableHitboxes
Add ModelEntity.SurroundingBoundsMode
Add ModelEntity.AddCollisionLayer/RemoveCollisionLayer
ModelEntity default to CollisionLayer.Solid
Create SurroundingBoundsType.cs
Update collisionproperty.def
Removed SetupPhysicsFromUnscaledModel
Debug Shit
Merge branch 'master' of sbox
