Full code base rewrite & some features

[qxb3]

Motivations:

EDIT: this rewrite will be fum's v2.

• Everything is confusing.
• mpris crate doesn't support async and unmaintaned.
• Everything is done thru polling because of above. Meaning that every some milliseconds or whatever u put in the fps it will fetch a new music info which is not ideal for performance and i want to update the song as soon as the music metadata changes.
• I want async
• I want async
• I want async
• Please let me have my beloved tokio!
• Transitioning to async means that fetching and displaying the cover art will be done async and will not block rendering, same can said on input handling.
• So i can procrastinate on other projects.
• Also be rewriting the internals of widget placements. Things can be unpredictable.

Features i want to add (no pinky promise):

• Have an option to just play your mp3's. This way fum will be a dedicated music player instead of relying on mpris. mpris feature will still exists and will be the default and will be the secondary, fum being a dedicated music player will be the default.
• Track or Playlist viewer / selector widget. so this thing can be possible (it looks so cool)
• discord rpc
• Config hot reload

Progress / TODO's

• mpris implementation (mostly done or usable)
• basic terminal functionality (rendering, input handling)
• display music infos (non widget way just for prototyping)
• play .mp3
• decode that .mp3 metadata
• reimplement widget including the placement of them
• config hot reload Auto reload config #42
• [some more will be added in here]
• done