Song name in startup + app on quit

[thanasis457]

Issues:

• When Playful launches Spotify, only the song name shows up, without the artist.
• If Spotify is closed then we should not launch it
• If Spotify closes while Playful is on it should detect that.

[thanasis457]

1. Spotify seems to have fixed that on their own.
2. This requires a further look.
3. This requires a further look.

[thanasis457]

Playful now detects if Spotify is closed and does not query it.