Core: apworld metadata and versioning

[Silvris]

What is this fixing or adding?

Adds the ability to include an optional metadata file that defines specific information about a given apworld. These include

• world version
• minimum generator version
• maximum generator version
• architecture/os/python version

Additionally, exposes the ability to require a certain world version from within a player yaml.

It should be noted that the ExportWorld.py is used (with permission) from @zig-for 's apworld manager with minor changes.

How was this tested?

Manually, via attempting to reach every codepath with customized metadata/yaml. No automated testing was added.

Opening as draft for additional testing and other missed locations (such as docs updates).

Some points of discussion:

• Should more be included on the world metadata immediately, such as authors/maintainers?
• Should ExportWorld be used within setup.py, and should it be moved to being a base-level script? (Notably, this fixes LADX compatibility)
• Defaults for min_generator_version and max_generator_version

If this makes graphical changes, please attach screenshots.

Example metadata:

{
    "game": "Mega Man 2",
    "world_version": "0.3.1",
    "min_generator_version": "0.5.0",
    "description": "In the year 200X, following his prior defeat by Mega Man, the evil Dr. Wily has returned to take over the world with\n    his own group of Robot Masters. Mega Man once again sets out to defeat the eight Robot Masters and stop Dr. Wily.",
    "game_id": "mm2",
    "frozen": false,
    "arch": "any",
    "os": "any",
    "pyversion": "any"
}