Feature request: allow matchclock to only receive one arg from QC

[KillianMiles]

Requesting to allow matchclock to still display MM:SS time if only one float is passed to it by QC (i.e. seconds). So if both standard PQ args are passed (cur_min & cur_sec) - the clock acts normally, displaying MM:SS, but if only one arg is passed - it interprets it as seconds and displays MM=floor(seconds/60) and SS=seconds - floor(seconds/60).

This has two benefits without breaking PQ-style compatibility:

1. You only have to network one float instead of two
2. You could give matchclock the ability to display tenths of a second for some cool points