`item.itemUser` replaces `item.zMoveUser`, and is a new field
representing a list of possible users of an item, for items that are
restricted to specific species.
`item.zMoveUser` is a base forme for items that affect every forme, and
a forme name otherwise (forme name is currently only used for
`forcedForme` uses).
Arceus is a weird case. Both generic Z crystals and Plates, while
having unique effects on Arceus, also have effects on other Pokémon.
For this reason, Arceus isn't listed as an `itemUser` of either of
these item types - use-cases that want this should also check
`item.forcedForme`.
This is mostly intended to be useful to move-searching and custom
rules (like NatDex, which will only allow past-gen items associated
with removed species).
In most other similar systems, like TeamValidator, we use `thing.dex` instead of having it extend `ModdedDex`. Battle has always extended `ModdedDex`, though. This changes Battle to match the others.
This should fix an issue with `Battle.data` not being cached.
This also frees up Battle to extend ObjectReadWriteStream<string> in a future update.
Also move mods/ to data/mods/
This makes PS more monorepo-like. The intent is to further separate
the sim and the server code, but without fully committing to splitting
the repository itself.
We now support `./pokemon-showdown start` in addition to
`./pokemon-showdown`. I'm not clear which I want to be the default
yet.
