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/hk/__init__.py

@@ -72,15 +72,12 @@ class HKWorld(World):
     def set_rules(self):
         set_rules(self.world, self.player)
 
-
     def create_regions(self):
         create_regions(self.world, self.player)
 
-
     def generate_output(self):
         pass  # Hollow Knight needs no output files
 
-
     def fill_slot_data(self): 
         slot_data = {}
         for option_name in self.options:
@@ -92,6 +89,7 @@ class HKWorld(World):
         item_data = item_table[name]
         return HKItem(name, item_data.advancement, item_data.id, item_data.type, self.player)
 
+
 def create_region(world: MultiWorld, player: int, name: str, locations=None, exits=None):
     ret = Region(name, None, name, player)
     ret.world = world