Implementation of Steam_AppTicket::GetAppOwnershipTicketData

[NotAndreh]

This provides a partial implementation for Implementation of Steam_AppTicket::GetAppOwnershipTicketData.
This fixes the check that Capcom has been doing in Resident Evil Requiem, they exploited the fact that this function isn't implemented on GBE. In case of RE, only the appid is checked.
The signature can't be replicated cause it's generated by Steam.

For additional infos, the official Steam documentation about the method is available here: https://web.archive.org/web/20230315041727/https://partner.steamgames.com/doc/api/ISteamAppTicket

[Detanup01]

uint32 size is 4 and uint64 size is 8
I am confused why steamid pointer isnt 4 and the signature isnt 8+4 (12) (and the sign len isnt 4 when it set as uint32

[NotAndreh]

The pointers like steam appid, steam userid are offsets. Since I need to write an u64 (steamid) I avoid alignments issues by writing it at offset 8.
The signature has a offset too and a length, I choose 8 as a stub.

[NotAndreh]

Just for example the real steam api returns the appid at offset 16 and userid at offset 8 usually

[Detanup01]

OH soory I didnt see the reinterpret_cast<uintptr_t>(pvBuffer) + 8 allignment "fix"