Update voxel-fuel - more multiplayer fixes; player movement/disconnect. Ref GH-26

deathcap/voxel-fuel@6db7fc7511dd8c50c1781c3d7d40a1ca956867f6 Update voxel-client, voxel-plugins, voxel-server

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