Wario Land 4: Implement new game

[lilDavid]

What is this fixing or adding?

Adds Wario Land 4 as an available game for AP.

How was this tested?

Many playtests and unsupported games over several APworld releases.

If this makes graphical changes, please attach screenshots.

[ScipioWright]

I'll throw in a review later, but for now: be sure to add your game to the Archipelago README.md and to add yourself to the CODEOWNERS file in the Archipelago docs folder

[Exempt-Medic]

Something else I forgot to mention, you may want to implement a get_filler_item_name function, so that when the multiworld has to ask for items from your world (like with plando or itemlinks) it will only pull from filler items you define instead of all items, including progression ones. Another thing you could consider is adding start_inventory_from_pool support, it's a pretty simple options change and you wouldn't have to rearrange anything to support it (it would also benefit from get_filler_item_name).

[lilDavid]

Some more comments. One general question I have is why this code is using Sequence and Mapping so much instead of List and Dict?

I like to use Sequence and Mapping because they give more of a hint that the value won't be modified. I use tuples as immutable sequences a lot, and Sequence covers both tuples and lists.