Restructure into package format

OpenCore-Patcher-GUI.command

@@ -1,6 +1,9 @@
 #!/usr/bin/env python3
-# Copyright (C) 2020-2022, Dhinak G, Mykola Grymalyuk
-from resources import main
+"""
+PyInstaller Entry Point
+"""
+
+from opencore_legacy_patcher import main
 
 if __name__ == '__main__':
-    main.OpenCoreLegacyPatcher()
+    main()