The following commits do the following:
It enables playNow action when paused so that playback can be restarted from the playlist.
It implements double click on the entry to start music playback.
It moves the playIcon next to the right side of the title. This makes the icon IMHO more noticeable.
Also, as the playNow button and the remove button do not change position this way, the playlist gets visually smoother.