adds the ability to actually vote for maps instead of using tg's biased preference-based voting system (#7743)

code/controllers/configuration/entries/general.dm

@@ -250,6 +250,8 @@
 
 /datum/config_entry/flag/maprotation
 
+/datum/config_entry/flag/tgstyle_maprotation
+
 /datum/config_entry/number/maprotatechancedelta
 	config_entry_value = 0.75
 	min_val = 0

code/controllers/subsystem/ticker.dm

@@ -449,9 +449,12 @@ SUBSYSTEM_DEF(ticker)
 	maprotatechecked = 1
 
 	//map rotate chance defaults to 75% of the length of the round (in minutes)
-	if (!prob((world.time/600)*CONFIG_GET(number/maprotatechancedelta)))
+	if (!prob((world.time/600)*CONFIG_GET(number/maprotatechancedelta)) && CONFIG_GET(flag/tgstyle_maprotation))
 		return
-	INVOKE_ASYNC(SSmapping, /datum/controller/subsystem/mapping/.proc/maprotate)
+	if(CONFIG_GET(flag/tgstyle_maprotation))
+		INVOKE_ASYNC(SSmapping, /datum/controller/subsystem/mapping/.proc/maprotate)
+	else
+		SSvote.initiate_vote("map","server")
 
 /datum/controller/subsystem/ticker/proc/HasRoundStarted()
 	return current_state >= GAME_STATE_PLAYING

code/controllers/subsystem/vote.dm

@@ -139,6 +139,12 @@ SUBSYSTEM_DEF(vote)
 						restart = 1
 					else
 						GLOB.master_mode = .
+			if("map")
+				var/datum/map_config/VM = config.maplist[.]
+				message_admins("The map has been voted for and will change to: [VM.map_name]")
+				log_admin("The map has been voted for and will change to: [VM.map_name]")
+				if(SSmapping.changemap(config.maplist[.]))
+					to_chat(world, "<span class='boldannounce'>The map vote has chosen [VM.map_name] for next round!</span>")
 	if(restart)
 		var/active_admins = 0
 		for(var/client/C in GLOB.admins)
@@ -194,6 +200,10 @@ SUBSYSTEM_DEF(vote)
 				choices.Add("Restart Round","Continue Playing")
 			if("gamemode")
 				choices.Add(config.votable_modes)
+			if("map")
+				choices.Add(config.maplist)
+				for(var/i in choices)//this is necessary because otherwise we'll end up with a bunch of /datum/map_config's as the default vote value instead of 0 as intended
+					choices[i] = 0
 			if("roundtype") //CIT CHANGE - adds the roundstart secret/extended vote
 				choices.Add("secret", "extended")
 			if("custom")