StoryWeeklist + Week class+ loading weeks fix

BIG REWRITE!!
a 2 YEARS OLD commit, are we DEADASS for never noticing the way they loaded😭🥀

source/funkin/game/PlayState.hx

@@ -12,7 +12,7 @@ import funkin.backend.chart.Chart;
 import funkin.backend.chart.ChartData;
 import funkin.game.SplashHandler;
 import funkin.backend.scripting.DummyScript;
-import funkin.menus.StoryMenuState.WeekData;
+import funkin.backend.week.WeekData;
 import funkin.backend.FunkinText;
 import funkin.backend.scripting.Script;
 import funkin.backend.scripting.ScriptPack;
@@ -1961,7 +1961,7 @@ class PlayState extends MusicBeatState
 	 */
 	public static function loadWeek(weekData:WeekData, difficulty:String = "normal") {
 		storyWeek = weekData;
-		storyPlaylist = [for(e in weekData.songs) e.name];
+		storyPlaylist = [for (e in weekData.songs) e.name];
 		isStoryMode = true;
 		campaignScore = 0;
 		campaignMisses = 0;
@@ -1994,7 +1994,6 @@ class PlayState extends MusicBeatState
 	 */
 	public static function __loadSong(name:String, difficulty:String) {
 		PlayState.difficulty = difficulty;
-
 		PlayState.SONG = Chart.parse(name, difficulty);
 		PlayState.fromMods = PlayState.SONG.fromMods;
 	}