This allows us to use different colours for different timers,
which will be useful when we add a pacing timer.

This will allow us to reuse the display code for displaying
an additional pacing timer.

Closes #1392.

This prevents the upcoming slide on the notes page from triggering
slidechanged events.  I believe this fixes issue 578, as well.

Resolves an issue where the first label (e.g., first bullet or first
number) of a list would wrap to the right side of the window and be
hidden under the clock element.

show error when notes run on non-http, fix load order to make sure upcoming slide is correct when notes open (#278)

Its was impossible (at least for me) to keep the windows in sync without bloating the code too much.