Ability to import pithouse preset json files

[Nubston]

Pretty much as the title says make it so I can import all my. Presets I have saved on pithouse caue damn it would make life a whole load easier jumping between games

[nikidigi]

This is a really needed feature, so I made a simple Pit House to Boxflat converter. It only imports wheel base presets, but that's pretty much enough imo. Tested on my R5. You can check it out here.