Add Potato Mode to the game#652

While we currently have a Potato Mod for the game to try and make it run more smoothly, it may be worth having an “official” implementation in order to allow for more limited configs and the Steam Deck to hit stable framerates. It could be in a similar vein to Skullgirls where you can switch between 3D or 2D pre-rendered backgrounds for stages in order to avoid having to stare at the void left by the current Potato Mod