Grass now grows under up-side-down slabs
Remove old function
Merge branch 'master' into Slabs

Conflicts:
	src/Blocks/BlockDirt.h
Add CanChangeDirtToGrass function to Block Handlers.
Merge branch 'master' into Slabs
Remove old import
Small changes
Some change to Entity.cpp

* Added comments to BroadcastMovementUpdate() and the collision tracer
Merge branch 'master' into fixes

Conflicts:
	src/World.h
Implemented suggestions
More comments!

* Also fixed a potential issue with position sending - if someone moved
slowly enough, their position would never be updated.
A tiny speed improvement in ApplyFoodExhaustion()
Redstone simulator now directly accesses cChunk

* Redstone simulator performance improvements
* Added return values to some functions
* Minor fixes
Fixed warnings in Lua helpers.
Fixed warnings in ManualBindings.
HOOK_DISCONNECT has cClientHandle as its first parameter.

Ref.: #655.
APIDump: Improved error handling in API file loader.
APIDump: Updated the OnDisconnect hook docs.

Ref.: #655.
Added a sanitizer for Spawn egg damage value.

This disallows spawning unknown mobs from unknown spawn eggs. Ref.: #928.
Fixed MagmaCube spawning.

Fixes #928.