v3.0.0: Rewrite + Working configuration settings

I've rewritten a portion of the program. While I did that, I made config.json actually functionable and modifiable through the UI. Instead of only ever searching users/music, you can now set your own sound directories. Within that sound directory, you can choose to ignore certain folders using a comma-separated list.

Full Changelog: v2.1.1...v3.0.0