RIP: MultiMystery and Mystery, now there's just Generate

Other changes:
host.yaml Multi Mystery options were moved and changed
generate_output now has an output_directory argument
MultiWorld.get_game_players(<game>) now replaces <game>_player_ids
Python venv should now work properly

worlds/minecraft/__init__.py

@@ -78,7 +78,7 @@ class MinecraftWorld(World):
         self.world.regions += [MCRegion(*r) for r in mc_regions]
         link_minecraft_structures(self.world, self.player)
 
-    def generate_output(self):
+    def generate_output(self, output_directory: str):
         import json
         from base64 import b64encode
         from Utils import output_path