Use a proper icon when the server does not provide it

*In the now playing fragment use iradio_noart for remote streams otherwise
 album_noart. Also use a larger icon for the full heigt layout and a smaller
 icon otherwise.
*Try to figure out which icon to use for plugin items (currently internet
 radio stations and favorites.
Use more appropriate icons when the server does not provide one.

- In the now playing fragment use iradio_noart for remote streams
  otherwise album_noart.

- Use a larger icon for the full height layout and a smaller
  icon otherwise.

- Try to figure out which icon to use for plugin items (currently internet
  radio stations and favorites.

Merges commit '6ef3515fdf0d6bd18f7c8b10687c5860f327997c' into actionbar.