Allow stop or cancel without "off" output

[mgiggs]

Adding the ability to stop or cancel the timer with no output to the "Countdown stop/start payload".

[StephanStS]

@mgiggs: Has your pull request the ability to restart the time at the current timer value (in a pause/restart manner), or can it only hard stop the timer?

[goofy1988]

Please add this "cancel" option without the "stop payload trigger". That would be a great feature. Thanks

[develmac]

Especially sending 0 on the second output when the timer was canceled is really confusing. This for one makes it impossible to properly use it with some motion detectors. Please add this feat! :)

[marc-gist]

Especially sending 0 on the second output when the timer was canceled is really confusing. This for one makes it impossible to properly use it with some motion detectors. Please add this feat! :)

Check out my fork perhaps it will work for you: https://github.com/marc-gist/node-red-contrib-countdown
On cancel, I add a flag to the second output indicating that it was cancelled (true/false).