Remove nether mod for update

THIS IS NOT A STABLE VERSION AT ALL!
This commit is just supposed to remove nether mod to avoid conflicts when
the branch will be merged, after updates. It's also a check point from
where I can rebase my updates if they break the repository.
Adding new version
Applying our own changes
- Nether apple giving 9 of hunger
- Come back in real world at static_spawnpoint or MFF's spawnpoint
Merge branch 'nether_update_without_conflicts'