Create our own dat-gui and pluginize voxel-debug
Simplex terrain
Switch to voxel-perlin-terrain for chunk generation
Add trees
Generate perlin terrain only at surface level; disable tree gen for now
Populate trees on chunk generation

Requires https://github.com/deathcap/voxel-forest/commit/e21ec8f791b9d0a1e556b60a3e4cd159336a81c3
Fill all lower chunks with stone