Adds mod compatibility for Gateways to Eternity
Currently includes compatibility for the following mods:
-Rats (4 Gateways)
-Born in Chaos (4 Gateways)
-Aquamirae (2 Gateways)
-Alex's Mobs (1 Gateway)
These gateways all include rewards for completing them that relate to the mods they're using.
(Feel free to suggest mods that I could add compat to)
