Add LocalizedDatasetPrototype

[Tayrtahn]

About the PR

Adds a variant of DatasetPrototype specifically for cases where a dataset of sequentially-numbered LocId strings is desired (like tips, word lists, advertisements, etc).

Why / Balance

This saves you from having to make a dumb boilerplate YAML file that just lists all the LocIds like:

- type: dataset
  id: Test
  values:
  - test-string-1
  - test-string-2
  - test-string-3
  - test-string-4
   ...
  - test-string-128
  - test-string-129

and instead lets you just do:

- type: localizedDataset
  id: Test
  values:
    prefix: test-string-
    count: 129

Technical details

On the C# side, LocalizedDatasetPrototype can be used just like a regular DatasetPrototype - Values implements IReadOnlyList, so you can index it, iterate through it, or (the most likely case) pass it to RobustRandom.Pick to get a random entry.

Behind the scenes though, any operations on Values will actually just construct the LocId strings from the prefix and index number. This should also cut down on the memory usage of localized datasets, since they won't need to actually store all the LocIds and can just construct them as needed.

Also includes a unit test to demonstrate that it works.

Media

Code.

• I have added screenshots/videos to this PR showcasing its changes ingame, or this PR does not require an ingame showcase

Breaking changes

Changelog

Nah.

[mirrorcult]

very nice

[TheShuEd]

Woah, very cool

[TheShuEd]

LocId datasets from random books are worth translating to this system as well

[EmoGarbage404]

can you add a evenly-weighted random pick method for parity with normal datasets?

[Tayrtahn]

can you add a evenly-weighted random pick method for parity with normal datasets?

In SharedRandomExtensions? Sure.