Remove unnecessary changes added in texture atlas revert

Unused, so removed -- was accidentally added in https://github.com/deathcap/voxel-engine/commit/47a05ba8132263d9490e8b6f895f689befaf17fa
Update to use my branch of voxel-texture
Use more compatible texture API

Requires https://github.com/deathcap/voxel-texture/commit/42c6f3b10f669181b1b9f51de030af1d15e5a73d

Ref https://github.com/deathcap/voxpopuli/issues/19