Suggestion: MM integration for CaptureSites and Mob Spawning as defenders

[Yriokiri]

Please explain your feature request to the best of your abilities:

It would be cool to have the possiblity to a spawning system for mobs(vanilla & custom ones, in particular i would need support for MythicMobs) in un-captured sites to act as defenders when no town is controlling a Site.

the system could work with spawning points so i choose a coordinate for the mob/mobs to spawn. to capture the site player need to kill them all, if player start raiding the captureSite but the capture fail/player leave the mobs will respawn.

would be nice to have way to discern for MythicMobs the town affiliation of a player but i think that is more a job for MythicMobs plugin to do.