Updated the auto tracking logic (for sites like facebook.com) to be more aggressive by lowering the time frame from 2000 ms down to 250 ms as well as adding in new event listeners.

Add per-domain Sticky Volume setting in GUI (default to on for Facebook; off everywhere else)
Fixed volume not persisting across page reloads on Facebook
Fixed Google Drive video player support (all_frames enabled)
Eliminated initial volume spike on page load (will default to zero and ramp up instead of 100% and ramping down).

Excluded youtube.com to prevent volume from spiking; added ability to manually exclude (or include) domains going forward.