Add CrucialVoxel and colorcoding of it
Refactoring
Merge pull request #178 from voxelinc/code_crucial

Add CrucialVoxel and colorcoding of it
Merge branch 'master' of https://github.com/voxelinc/voxellancer into voxeltreenode-ref-in-voxel

Conflicts:
	src/voxel/specialvoxels/cockpitvoxel.h
	src/voxel/specialvoxels/enginevoxel.h
	src/voxel/specialvoxels/fuelvoxel.h