Makes endermen into an old form, changing their:
. loot table
. eyes texture
. sounds

Warning! The "sounds.json" file that was supposed to change the sounds of the endermen accidentally broke all the sounds. I was just trying to change the endermen sounds to their legacy, but when I played with the mod, I didn't hear any sound coming from the game. I knew that there wasn't a "sounds.json" file in the "<version>.jar" file.
By the way, I tested the mod in "1.RV-Pre1".