* Pistons/Ice no longer need to FastSetBlock first (#4600), and the former don't drop items when broken in creative
- Begin migration away from stationary fluids
* Tick the chunk after applying a client's changed
* Broadcast pending blocks at the end of a tick
* Fix stack overflow in breaking ice.
Stupid fix, but it does work and is used in other places too...
* Replace hotfix for pistons with better one
* Fix comments in BlockBed handler
Changed the signitures of the following to use interfaces:
GetPlacementBlockTypeMeta
OnPlaced
OnPlacedByPlayer
OnDestroyed
OnNeighbourChanged
NeighbourChanged
OnUse
CanBeAt
Check