Delete the corresponding song file within the application.

[Nine2333]

Because I am a heavy gamer and also a self-made score composer, due to the different update progress of the music packs provided by different authors, there are often duplicate music imports. I hope that a long press music deletion function can be added to the game UI, which will be very helpful for me to organize game files! Thank you very much!

[DavidScann]

A general chart manager feature will be added later down the line; has been on the roadmap for a while. Thanks for the feedback though!