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/backend/week/WeekData.hx

@@ -0,0 +1,29 @@
+package funkin.backend.week;
+
+import flixel.math.FlxPoint;
+import haxe.xml.Access;
+
+typedef WeekData = {
+	var ?xml:Access;
+	var name:String;  // name SHOULD NOT be used for loading week highscores, its just the name on the right side of the week, remember that next time!!  - Nex
+	var id:String;  // id IS instead for saving and loading!!  - Nex
+	var sprite:String;
+	var chars:Array<WeekCharacter>;
+	var songs:Array<WeekSong>;
+	var difficulties:Array<String>;
+}
+
+typedef WeekCharacter = {
+	var ?xml:Access;
+	var name:String;
+	var ?spritePath:String;
+	var ?scale:Float;
+	var ?offset:FlxPoint;
+	// var frames:FlxFramesCollection;
+}
+
+typedef WeekSong = {
+	var name:String;
+	var hide:Bool;
+	var ?displayName:String;
+}