ndarray/JSON distribution

[deathcap]

https://github.com/mikolalysenko/isabella-texture-pack is distributed as a JSON file, exported as an ndarray - maybe ProgrammerArt should too?

[deathcap]

Probably not too difficult to do this, since pre-'stitched' texture atlas images are already generated (added in GH-3 for the 'stitch pack' as I called it), only need to wrap it in a module and return an ndarray. Then it should be directly usable with voxel-mipmap-demo. However, adding resource pack loading support instead would enable more possibilities deathcap/game-shell-voxel#1 with no change needed on ProgrammerArt's part (but, more distribution formats the better...).