General: Move generic IDs from LttP to new Generic World
Generate: ensure thread errors are collected before data from their completion may be referenced in playthrough/spoiler
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
(There's still a lot of work ahead, such as:
registering locations and items to the World, as well as methods to create_item_from_name()
many more method names for various stages
embedding Options into the world type
and many more...)