Client-only plugin

Requires deathcap/voxel-plugins@eb3a34dfd700bbac367089e54e5a1c3c7646a96c
Change to transgreedy mesher default (TODO: stop hardcoding default here)

Requires deathcap/voxel-engine@7d9d7ff0ec8b8f6b7f86bc85f5290ec32fa91875