Added support for Jacob+Esau and (probably) multiplayer in general.

Joker doors remember their position in the room and will not deviate from it.
Joker doors now spawn behind you instead of on the opposite side of the room (unless door priorities intervene).
Exiting a blinking Joker door starts the blink animation on Devil/Angel.
MC_POST_UPDATE instead of MC_POST_RENDER.

Joker doors now persist even after you quit and reload the game.
Joker doors are now reflected in the Downpour/Dross Mirror Dimension.
Using a Joker card in a crawlspace now spawns a Joker door in the room "outside" the crawlspace.
Fixed a visual glitch with Joker doors in the Hush fight.
Fixed a visual glitch with Joker doors blinking on Mega Satan's door.

Joker door replacements now prioritize "normal" doors over locked/secret/special ones.
Fixed Joker doors in crawlspaces/black markets.

Joker door replacements now prioritize "normal" doors over locked/secret/special ones.
Fixed Joker doors in crawlspaces/black markets.

Removed a bunch of debug stuff.

Fixed a minor bug with Joker cards in the Ascent.
Fixed a rare crash in Home.

No more hotfixes. Everything simply works.