Removes drifters from the game.

Patch code originally by CJHKnight2 for their mod "No Bells or Drifters", but it has not been maintained since 1.14.7 and only patched out bells and drifters in the same mod. I decided to expand the idea to all aggressive entities in the game, and make the mods individual.

I will be maintaining these mods into the future as well as making patches for new aggressive mobs added to the game.