Trident loyalty return event

[TheBentoBox]

An event when a trident returns due to the Loyalty enchantment would be nice.

I ask for it on Purpur rather than on a higher level because there's the custom Purpur setting for making loyalty tridents return at void height, and I figure you may need to fire the event from an additional location to accomodate for that custom behavior as well. Not sure if it runs through the same channels as the standard Loyalty procs.