Fadeout container for blacklisted song/album/artist.

[BumbleFlash]

Is your feature request related to a problem? Please describe.
Blacklisting could be potentially improved by fading out the song from the library instead of removing it altogether. That way, we could do the same if not similar behaviour for a blacklisted song already present in the playlist.

Describe the solution you'd like
Fade out the information container if the song is blacklisted.

Describe alternatives you've considered
Leave it as-is.

[barbeau]

We should also rename the "Blacklist" feature to "Disable"

[BumbleFlash]

Per discussion today, we think changing the behavior of Blacklisting could be trickier than we thought.

To track we discussed,

1. Remove the code from the InclExclTransformer() function that filters the blacklisted song entirely. Add a public function in the SongRepository that returns the list of blacklisted items. Have an overlay view on the data containers that can be set to visible for a blacklisted song to fade out the container.

2. Have a property isBlacklisted in the Song model class and set it true when the path of the song appears in the blacklisted items.

[barbeau]

Per previous discussions, we're going to table this for now and just remove the "Blacklist" feature from the UI and revisit in the future.