Add voxel-food - currently adds cookies (only available in creative), eat to heal

Update voxel-health, voxel-use

deathcap/voxel-health@5e40ebdaefa88f333e7fd17aeb43ea53add43c9e Return effective amount from heal/hurt()
deathcap/voxel-use@2e09a12812e89cdbba8d856a40bffb9c4aab22ba Add onUse callback for using items

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