Improved lastfm support

[al1-ce]

Added:

• Tracks will now be displayed as "currently playing" on lastfm after 2.5 second

Changed:

• Tracks will be considered played after either 1/4 length of track or 25 seconds (picks lesser one) (consider tracks that are >1hour long, it'd be 25 minutes vs 25 seconds... yea)

Fixes #675 and develops on #288

Also on my experience musikcube refused to build without #662