Xist

For now I `#ifdef`d out the `ClearActivity` code since it doesn't do anything other than generate an error. You can see the exact code to repro here: https://github.com/XistGG/DiscordGameSample/blob/main/Source/DiscordGameSample/CustomDiscordGameSubsystem.cpp

> the ClientID has to be baked into the constructor, which means blueprints can’t change it. Why not allow blueprints to change it so people can just easily use the...