Redstone simulator now directly accesses cChunk

* Redstone simulator performance improvements
* Added return values to some functions
* Minor fixes
Fixed lever and button powering direction
Merge branch 'master' into redstoneimprovements

Conflicts:
	src/ClientHandle.cpp
	src/Entities/FallingBlock.cpp
	src/Mobs/AggressiveMonster.cpp
	src/Simulator/IncrementalRedstoneSimulator.cpp
Fixed 027efe09ea3d3222c3cbf169643e57773c1614ae
Merge pull request #956 from mc-server/redstoneimprovements

Redstone simulator performance and functionality improvements.