feat: sort by title name in level selection

lib/level_selection.dart

@@ -135,7 +135,7 @@ class _LevelSelectionState extends State<LevelSelection> {
     final directory = Directory(directoryPath);
     try {
       // List all files and folders in the directory
-      return directory
+      List<Simfile> simfiles = directory
           .listSync()
           .where((entity) => FileSystemEntity.isDirectorySync(entity.path))
           .map((entity) {
@@ -143,6 +143,9 @@ class _LevelSelectionState extends State<LevelSelection> {
         simfile.load();
         return simfile;
       }).toList();
+      simfiles.sort((a,b) => a.tags['TITLE']!.compareTo(b.tags['TITLE']!));
+
+      return simfiles;
     } catch (e) {
       print("Error reading directory: $e");
       return [];