Re-enable voxel-mine, voxel-harvest without an overlay for now - Update voxel-engine, voxel-mine

deathcap/voxel-engine@104ef59f709c5d070d87ef146736aee6a8f82403 Update to voxel-stitch ^0.7.1, fixes item textures with voxel-registry
deathcap/voxel-mine@1f8c73d0f2fcb9797c3bc3335ee2f15497946997 Add disableOverlay option, and auto-disable with game-shell. Closes deathcap/voxel-mine#3

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