Stopwatch could/should have additional feature: Countdown

Submitted by Öyvind Saether

Assigned to Natanael Copa @ncopa

Link to original bug (#15611)

Description

Since I have Stopwatch Plugin v0.3.1 in my panel now after testing it it occurs to me that it lacks a vital feature similar software ("apps") on cellphones have: A count-down.

I know Countdown is not Stopwatch but it's related and "Clock" applications on phones have both.

Real world use-case for such an app would be I just put my clothes in the washing machine. It will take 45 minutes. I could time that with Stopwatch and look at it from time to time but it would be better if the panel application would count down and perhaps do a notification or dialog when it's done.