Feature request #518: REQUEST: Pass information to handlers in "Track change" AppleScripts

As requested here:

https://wincent.dev/a/support/forums/ubbthreads.php?ubb=showflat&Number=1143

"So the script just gets executed and there are no handlers we have to implement, correct? So the script has to investigate iTunes each time to see what has happened. This is not all that efficient. I'd much rather see Synergy calling different handlers in the script, such as "track changed", "playback paused", "playback resumed", etc. And each handler would be sent some sort of object specifier for the current track, possibly the just the ID or a full object specifier. That way the script doesn't have to send more events back to iTunes and can act directly on what has happened."