Rearranged boss system to allow setting boss for any arbitrary floor.

Rearrange ENTITY_SPAWN callbacks & add DoesDoorMatch function.

Make GetCustomDoors properly return doors with name.

POST_CHECK_VALID_ROOM allows taking weight as a return value, more lenient roomgfx requirements.

Fix bosses not being properly random.

Fix for volume spike and boss music ending only on clear rather than boss kill. Also added GetCustomDoors.

Fix REVEL dependency + support selecting only a certain roomtype from a list.

Support Grid Stacking and fix controller triggering roomnames by removing hotkey.

Fix not changing custom grid update callback ID & nil error typo in npc deleteme.