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/modules/escape_menu/details.dm

@@ -35,7 +35,7 @@ GLOBAL_DATUM(escape_menu_details, /atom/movable/screen/escape_menu/details)
 		<span style='text-align: right; line-height: 0.7'>
 			Round ID: [GLOB.round_id || "Unset"]<br />
 			Round Time: [ROUND_TIME()]<br />
-			Map: [SSmapping.config?.map_name || "Loading..."]<br />
+			Map: [SSmapping.current_map.map_name || "Loading..."]<br />
 			Time Dilation: [round(SStime_track.time_dilation_current,1)]%<br />
 		</span>
 	"}