Add suport for spotifyd

[FranciscoVasconcelos]

I don't use the original spotify app neither the web app on chrome. I prefer using cli apps like spotify-tui with spotifyd daemon running in the background. That's why i'm asking to add support for spotifyd.

[XenHat]

I came here to file just such a request! I would like spotifyd support as well. I mostly use spotify-tui and spotifyd.

[aadibajpai]

@XenHat @FranciscoVasconcelos I'd love to add support for spotifyd/spotify-tui to swaglyrics for sure.

The way this can be done is getting the song and artist info from spotifyd if it is exposed. I will look into the repos to figure out if this is possible, then I can work on adding it to SwSpotify which is the cross platform library we use to get the currently playing song/artist.