Revert "trying to get materials working again..."

This reverts commit 4b2ef1e57683f09f149093a88b89562e8a983e48.
Revert "welp, here's some unfinished code, was trying to get dynamic texturing to work... fortunately, all this work will be silly to work on anyway! going to switch to voxel.js!"

This reverts commit 4c157075118b4367b274cca843e826b8278e980a.