Corrected Mob Heads

This small project was inspired by MC-91869 on the bug tracker and wanted to make this based on the screenshots on there. The files of the fixes that are currently on there do not work on the latest versions, and I wanted to share a working version of that. I have made sure this works with 1.11 and above. This pack makes mob heads look more distinguishable and recognizable in first person and third person view.

Also, I will not be making a version for 1.8 since models work differently in that version of the game.