Some refactoring
Remove circuit nodes duplicates from games/minimal/mods/default/init.lua
Remove circuit elements textures duplicates from games/minimal/mods/default/textures/
Initial support of 6d facedir + some refactoring.
Bug fixes + Some refactoring.
Add license headers
Add more circuit elements
Fix android paths
Fix mesh generation queue
Mesh queue limiter
Add ores to mgv5
Server side isOccluded for blocks sending (send less invisible blocks)
Small lighting fix
Better lighting timeouts
Remove some try-catch, remake some checks in lighting code
Merge pull request #105 from Selat/circuit

Circuit
Fix recursive lock in circuit
Merge remote-tracking branch 'upstream/master' into next

Conflicts:
	src/client.cpp
	src/nodedef.cpp