Fetch the player name from itch.io

[Mailaender]

Closes #14708

[pchote]

It might make sense to make this use an interface so that the discord module can implement it too?

[Mailaender]

If the Discord API supports it, I will do that as a followup pull request.

[abcdefg30]

Codes changes lgtm so far.

If the Discord API supports it, I will do that as a followup pull request.

I think we need to/should add a ExternalNameProvider class which implements IGlobalModData, and that class can then calls the integrations for itch, Discord, etc. I'm ok with not changing this here though, it should be a simple enough change in IntroductionPromptLogic.

There DiscordRpcClient offers a way to get the display and user names of the current user, so DiscordService can return it (client.CurrentUser.Username/DisplayName).

[anvilvapre]

Please don't even start extra threads if the api key is not set.

[teinarss]

Please don't even start extra threads if the api key is not set.

This will be done on the threadpool, which is already created elsewhere in the code. So im pretty sure no new thread will be created in this case.

[PunkPun]

LGTM, untested

[PunkPun]

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