Adds session playtime to gameInfo for Rich Presence

[Admiral-Billy]

As the title says, this adds the timestamp associated with how long you've been playing on a given save file to the gameInfo that my Rich Presence (or the console) grabs from. When on the menu, the total time you've had the app open is used, but when you're ingame, the total time that save file has been running is used. This doesn't account for reloads, but there's no way to get that information as far as I know.