Increase update rate of track slider

Increases the refresh rate of the track progress bar to 25fps.
This looks much better with moodbars than the previous 1fps.
All the common code that use to run at 1fps still retains that
rate so the overhead due to this is negligible.
Add constants to track progress timers
Change constant format
Merge pull request #4359 from TheUbuntuGuy/slider

Increase update rate of track slider