Remove unused (now integrated) game-shell-voxel require()
Use sphere world generator in voxel module by default instead of including our own
Accept a string value for opts.generate, indexed to voxel.generator

Allows demos to use the simple voxel generator methods in the 'voxel'
module, without having to include it themselves (and ensure it is the
correct version with ndarray support and so on).
Remove mesh debug log
Update voxel, voxel-mesher - chunking fixes

deathcap/voxel@005cefa451d6acf11359959ac2890f19fe57ada7 Remove deprecated API, voxelIndex/voxelVector
deathcap/voxel@bd2ff15f0ac44e10ebf543b9b0cbecc53c6f1a3d Remove meshers in favor of ao-mesher
deathcap/voxel@414e96cc0e79a7bf8f82e2b910d64309ae9ef3b7 Merge branch 'deathcap/master' into ndarray
deathcap/voxel@792b8b2c406f6f4721b77e1bad7027d0fe6d1a0f Pad voxel generate
deathcap/voxel@dbccd51529e339d3eb6827be32257f8a53d8c203 Converting to ndarray
deathcap/voxel-mesher@05ed980d31b0d1d0a4c5444876613ac0b3ccbc44 Fix translation vector ordering and offset

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