SC2: GUI Mission Launcher (#586)

* SC2: Functioning Starcraft 2 Mission Launcher UI

* AutoWorld: add .__file__ attribute to AutoWorlds
This tries to help with a recurring easy to make mistake, where ./worlds/myworld does not exist in frozen form and is instead ./lib/worlds/myworld

* SC2: get .kv file path correctly when frozen too

Co-authored-by: TheCondor07 <TheCondorian07@gmail.com>
Co-authored-by: Fabian Dill <fabian.dill@web.de>

worlds/AutoWorld.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import logging
+import sys
 from typing import Dict, FrozenSet, Set, Tuple, List, Optional, TextIO, Any, Callable, Union, NamedTuple
 
 from BaseClasses import MultiWorld, Item, CollectionState, Location, Tutorial
@@ -41,6 +42,7 @@ class AutoWorldRegister(type):
         new_class = super().__new__(mcs, name, bases, dct)
         if "game" in dct:
             AutoWorldRegister.world_types[dct["game"]] = new_class
+        new_class.__file__ = sys.modules[new_class.__module__].__file__
         return new_class