Move player model toggling logic to voxel-player. Ref GH-2
Start in first-person POV by default

More immersive
Hide logo in VR mode
Move block breaking to voxel-mine
Move hit raycasting to voxel-reach

Mainly so both voxel-mine and block placement don't have to raycast
Add block hardness in survival mode
Use insta-mine in creative mode; move hardness to voxel-mine
Handle break event from voxel-mine
Add voxel-debris (disabled for now)
Add voxel-debug gui
Merge master
Regenerate bundle.js