MultiServer: CreateHints command (Allows clients to hint own items in other worlds)

[NewSoupVi]

Supercedes #4316

Basically, this is supposed to supercede the concept of LocationScouts with create_as_hint in general, and have additional functionality.

Thanks to Jarno458 and EmilyV99 for their reviews on #4316, as well as Scipio's, alwaysintreble's and EmilyV99's (again) reviews on #3523. I apologize that your review work is lost, finding the right design is an iterative process that can only be done with reviewers' help :)

One question I anticipate is:
The code looks really similar to LocationScouts, so what was wrong with the original PR that allowed off-world LocationScouts?

The difference here is that this PR doesn't send back a LocationInfo packet, meaning that it can't be used to find your items in other slots. In fact, this packet will actually completely fail if any of the locations specified don't contain an item for the requestion slot, or the location doesn't even exist in the first place. Clients trying to find their remote items by scouting every slot one by one with their respective entire datapackage would've been very bad, but also very appealing.

[BadMagic100]

I didn't test it but this looks good. Assuming it is merged and once the client supports it I would want to migrate to use this exclusively rather than location scouts with create_as_hint.

I think it would be more correct in theory to pass a list of {location: int, status?: HintStatus} (typescript type here for brevity) but I can't think of the reasonable/common use case where the priority is actually different per location and the caller can send multiple packets if needed as a workaround

[Jarno458]

Personally for the case of the player gaining a lot of knowledge in bulk i would love to have a way to like hint 25 locations (like i do Satisfactory) without spamming the user
It currently do it by two location scounts, one to know what there without creating hints, and the 2nd to create as hint with only the progression items
Maybe create hints could support creating hints silently?

[NewSoupVi]

Personally for the case of the player gaining a lot of knowledge in bulk i would love to have a way to like hint 25 locations (like i do Satisfactory) without spamming the user It currently do it by two location scounts, one to know what there without creating hints, and the 2nd to create as hint with only the progression items Maybe create hints could support creating hints silently?

I don't think I wanna add that to this specific PR (I'd like to keep this initial PR somewhat "minimal"), but it's an idea we could discuss for expanding it