Move Race Timing Clock to the Python Script

[ghost]

The race timing clock is currently javascript on the race page. It does not persist if the race director navigates away from the race page and then returns. Move the timing clock to a python function with socket io updates back to the race page as needed. This might involve needed a separate emit for each audio cue as well.

[punkkills]

You could have a generic "play_cue" emit with some data describing which cue to play.

[ghost]

True, that would be the better way to do it.

Should also tie in with #18