Add Discord rich presence support

[marcelherd]

The Discord Game SDK could be leveraged to add additional information to your Discord status when you're playing Tekken 7, e.g.:

Playing Paul vs Eddy (2-0) on Mishima Building
Current session: 32 wins, 17 losses (65.3% winrate)

As the SDK is only provided as .dll, we could use e.g ffi-napi to load and use the library: Tutorial

To update the player's status UpdateActivity can be used.