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Firestarter

"Something mischevious has appeared in the Basement..."

This mod for AB+ adds a new boss exclusive to the Burning Basement: the Firestarter! It's bugged me for a while that the Afterbirth alternate floors never had their own unique bosses, so this is my small step towards remedying that.

The Firestarter has a 15% chance to replace the boss in Burning Basement I and II. His attacks are (obviously) themed around fire and his specialty is to light red fireplaces to shoot at you while you're busy whittling him down.

Credits to:
-LyteBringr for the tutorials
-RhenaudTheLukark for testing and generally being a really cool guy
-The folks in the Modding of Isaac Discord for answering my numerous random questions
-ReddehWow for the excellent boss portrait
-The Antibirth team (and LeatherIceCream in particular) for inspiring this mod: I reckon the Rainmaker wouldn't be too out of place as a Drowned Caves boss myself
-Oh yeah, and Ed and Nicalis for this nifty game :P

Bugs:
-The Firestarter can replace Famine and the Headless Horseman while still rewarding you with their items on death.
-Relatedly, leaving the boss room in any way will reset the whole thing: if you left the room while the Firestarter was still alive (via an item that gives revives, for example) then when you go back in you'll end up fighting the boss the Firestarter initially replaced, room layout and all. Exiting and re-entering after the Firestarter has been killed just adds the room layout of the replaced boss.
-Currently the Delirium form of the Firestarter isn't correctly implemented: Delirium is a whole different can of worms, heh.
-It's very likely that there are other bugs I've missed: the method used for implementing the Firestarter as a proper boss is remarkably hacky and I'm hoping that Nicalis will release a means of proper implementation in the near future.