Voxelization

This namespace allows for voxelization of meshes. The current implementation is simple:

* Create 13 principal axes for the voxel-triangle intersection

  * Use 'separating axes theorem': Check if there is a separation between the projection of both objects on each axis
  * If there is no separation, a voxel is set 

Voxels are defined as follows: Voxel with coordinate (x,y,z) goes from (x,y,z) to (x+1,y+1,z+1)