Rework MediaListUI

[SonicYeager]

ToDo

• Use selected AudioFileCover as Background but blurry
• Orientate on Groovy or Spotify for the list styling
• add a bit more meta data

[SonicYeager]

Maybe look into something like so: https://gist.github.com/superic/8165746
Hopefully support for similar arrives in Avalonia sooner or later!