Added user music system where you can import your own music to listen while racing

• Supported formats are: .mp3, .wav and .ogg Vorbis. You can put your files in user\\Documents\\Posthaste\\UserMusic and have them recognized automatically after loading a stage, OR manually scan them from settings/audio if you want to update the playlist without reloading the stage.

Added various post-processing options to Screenshot Mode

Rearranged the pre-stage menu

Added edge smoothing to the minimap on HUD

Added a separate SFX volume slider and updated the master volume option to go up to 125% for extra volume

Updated the appearance and animations of some UI buttons

Added support for repeating navigation inputs to the settings UI

Fog adjustments

Audio adjustments

Miscellaneous fixes