Remove demo - moved to voexl-example

https://github.com/deathcap/voxel-example
Remove three.js dependency
Update voxel-shader - meshes from game.voxels.meshes instead of option

deathcap/voxel-shader@ef900c1d1830773fd86f896936686860dc63bfe7 Get meshes from game.voxels.meshes if available

Commit message generated by https://github.com/deathcap/lmno-cl
Add missing .git extension to voxel dependency
Back to loading voxel-mesher as a plugin

Update voxel, voxel-mesher

deathcap/voxel@03c82f4ea95809110fe9afce98c2fa65ca9e8417 Merge branch 'upstream' into ndarray
deathcap/voxel-mesher@c4550ef120564518cd8a000657587328038f1736 Remove unnecessary plugin code
deathcap/voxel-mesher@b75fd51b6be3671a0f1f37f781e21ce8174f145e Revert "Remove plugin, export createVoxelMesh directly"

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