T206 Timer - Stop Time Button

**Is your feature request related to a problem? Please describe.**
I was head reffing a meet with <12 teams, so T206 (5min) field timers were running between some matches. Several times, teams were loaded on the field and ready before the end of the timer. Once, the timer ended as teams were asked if they were ready and a false start occurred when the team heard the timer-ending noise. There did not appear to be a way to stop the timer early from the Scorekeeper screens or from the Head Ref tablet to avoid this confusion. We did see the note that timers are under development.

It would also be nice if there were easier ways to display the timer on the field from the main event control screen. (the Scorekeeper was using the "display blank screen" on a display tab.)

**Describe the solution you'd like**
A T206 "Stop Field Timer" button on the main event Match Control screen at the top (near the load next match / show preview / show match / etc. buttons) to avoid audio cue confusion

**Describe alternatives you've considered**
"Stop Field Timer" under the "Timers" section on "settings" tab.

Additional support in the Scorekeeper Manual on Timers, when available.