[REVIEW ME PLS] Battle Monsters Card Game, or the last* PR. (#5141)

Overview
Adds Battle Monster cards. Battle Monsters is a collectable card game clone like Yugioh or magic the gathering. Players can purchase card packs and use them in games with actual rules to them.

Checklist
Card Generation Framework: 100%
Sprites: 80%
Game Rules: 90%
Deck Framework: 5%
Monster Cards: 20%
Spell/Trap Cards: 5%
Obtainable Status: 0%

code/modules/holodeck/HolodeckControl.dm

@@ -281,6 +281,8 @@
 	for(var/obj/holo_obj in holographic_objs)
 		holo_obj.alpha *= 0.8 //give holodeck objs a slight transparency
 
+	linkedholodeck.loop_ambience = HP.loop_ambience
+
 	if(HP.ambience)
 		linkedholodeck.forced_ambience = HP.ambience
 	else