Added a config.json associated ModConfig to allow setting screen resolution/windowed state.
Right now only works for Windowed/Fullscreen, borderless fullscreen would be nice but that was going to be quite a bit more involved.
Note when you boot up the game, it'll dump you a list of valid graphics options for your screen
For windowed mode, this doesn't matter as much (though it can be larger than your screen). For full screen you should match one of these resolutions or it's going to be super jank.