[Feature] Toggle CD progress display

[KaiSandstrom]

First a bit of a disclaimer: I haven't studied the source code, so I don't know whether this feature would be possible. If it's not possible and this is pointed out, I will close the issue.

This feature request is for a hotkey to toggle the CD progress display on and off.

I appreciate being able to see the current track timestamp, but I find it a bit distracting during gameplay. I'd prefer to be able to press a key and bring up the display when I want to see it, and press the key again to hide it.