Suggestion: Convert Header ID to proper SteamID3 / SteamID64 format

[Aemony]

Yo,

Unless there's some particular reason to retain the Header ID in its current form, I'd recommend switching over to displaying the proper SteamID3 and/or SteamID64 format instead, so that users can easily validate the given SteamID through a Steam Community Profile link or such.

See the below editor as an example:

https://github.com/Aemony/NieRAutomata-SteamID64-Editor