Adds support for a map rotation system. (#7162)

* Adds support for a map rotation system.
It is now the default way of selecting a map, map votes have been disabled.

* whoops

* Randomize the map it starts off with, too.
(it'd pick bagel every time otherwise)

* Address review

* remove knight from rotation due to it being an unmaintained map.

* minor cleanup

Content.Server/GameTicking/GameTicker.RoundFlow.cs

@@ -71,7 +71,7 @@ namespace Content.Server.GameTicking
             DefaultMap = _mapManager.CreateMap();
             _mapManager.AddUninitializedMap(DefaultMap);
             var startTime = _gameTiming.RealTime;
-            var maps = new List<GameMapPrototype>() { _gameMapManager.GetSelectedMapChecked(true) };
+            var maps = new List<GameMapPrototype>() { _gameMapManager.GetSelectedMapChecked(true, true) };
 
             // Let game rules dictate what maps we should load.
             RaiseLocalEvent(new LoadingMapsEvent(maps));