[MERGED PR] Adds chaplain mechanic 'faith'. Uses it for healing

[Frank_Stein]

Changed the pr to include healing instead of gun. I still plan on doing something to the gun, but that needs more work (probably just pretty much TDHooligan's idea)

Personally, I think there's humor in the Priest just whipping out a mundane gun and firing, but if some kind of faith integration were a thing and it were more closely tied to their Bible/Holy book, I'd do something with the effect being tied to holstering the gun back into the book.