1.8.8

1. Use pulsing, instead of spinning, icon for active tasks.
2. If encounter an invalid time when calculating queue duration, just ask LMS.
3. Queue item durations are floating point, so handle correctly.
4. Fix subtoolbar single line alignment.
5. Don't set mixer volume when changing players.
6. Move 'Zap' next to remove actions.
7. Only show 'Zap' if custom skip plugin enabled.
8. Fix broken add/play all.