Use same modelMatrix for phase 2 voxel chunk translation

deathcap/voxel-mesher@0f9a4c797cb6b7477b68e51c618de8cc42bc6a56
Update for .porous singular VAO instead of an array, drawn all at once

Requires deathcap/voxel-mesher@907b2030c056b64be45c31cf13150c7072ffb5dc
Remove custom setTestGeom method

It is easy enough to dynamically modify the block model from the console
by changing it in voxel-registry then refreshing, for example:

g.plugins.get('voxel-registry').getBlockProps('glassCover').blockModel=[{"from":[7,0,0],"to":[2,16,16],"faceData":{"down":{},"up":{},"north":{},"south":{},"west":{},"east":{}},"texture":"glass_blue"}];
g.showAllChunks()
Remove preloadTexture glass_blue, now we have voxel-glass for that
Remove another customGeomTest remnant
Update documentation
0.13.0