Persistent Map Vote Tallies (#86788)

## About The Pull Request

Changes map votes to be based on a persistent tally count.
Tallies for maps are cached between rounds and are added to by map
votes.
When a map is chosen, and it wasn't the only valid one, the tallies for
said chosen map will be reset.

Refactors map vote handling and moves it from SSmapping to SSmap_vote.
Rock the Vote has been removed as a result of this refactor.

## Why It's Good For The Game

Makes it more likely that all maps will be played over the course of a
server instead of always being truly random.
Removes some clutter off of SSmapping.

🆑
refactor: Map Votes are now carried over between rounds. When a map vote
is actually a contest, the winning map will have its votes reset.
/🆑

code/controllers/subsystem/library.dm

@@ -26,14 +26,14 @@ SUBSYSTEM_DEF(library)
 
 /datum/controller/subsystem/library/proc/load_shelves()
 	var/list/datum/callback/load_callbacks = list()
-	
+
 	for(var/obj/structure/bookcase/case_to_load as anything in shelves_to_load)
 		if(!case_to_load)
 			stack_trace("A null bookcase somehow ended up in SSlibrary's shelves_to_load list. Did something harddel?")
 			continue
 		load_callbacks += CALLBACK(case_to_load, TYPE_PROC_REF(/obj/structure/bookcase, load_shelf))
 	shelves_to_load = null
-	
+
 	//Load all of the shelves asyncronously at the same time, blocking until the last one is finished.
 	callback_select(load_callbacks, savereturns = FALSE)
 
@@ -59,6 +59,6 @@ SUBSYSTEM_DEF(library)
 
 /datum/controller/subsystem/library/proc/prepare_library_areas()
 	library_areas = typesof(/area/station/service/library) - /area/station/service/library/abandoned
-	var/list/additional_areas = SSmapping.config.library_areas
+	var/list/additional_areas = SSmapping.current_map.library_areas
 	if(additional_areas)
 		library_areas += additional_areas