Fix cobblestone -> stone

The (1>>15)+x IDs are off by one (block ID x-1)
Add multiple textures for grass block

(but still only using top texture)

Update voxel-stitch

deathcap/voxel-stitch@8026d9e64fc0534a3eb3becf01e8363222af494d Fill tile slots deterministically, in order called
deathcap/voxel-stitch@0fed713e179105c4067f7ff843691cad7c798872 Support multiple textures as arrays; refactor addTextureName/Pixels

Commit message generated by https://github.com/deathcap/lmno-cl
Grass block last
Move sample blocks to a plugin
Generate mipmaps only once all textures are loaded. Closes GH-1

Update voxel-stitch

deathcap/voxel-stitch@f368d5628a746726b69540a3f8767f04049ded2a Add addedAll event

Commit message generated by https://github.com/deathcap/lmno-cl