Handle inventory keybinding: open creative or crafting in creative mode and survival, respectively

Uses voxel-inventory-creative (if enabled) and voxel-inventory-crafting.
Moved from deathcap/voxel-fuel@f7f329bca84c3bf50f9edd4b03d2c34a21296014
Ref https://github.com/deathcap/voxel-fuel/issues/12