Allow to edit timers

[jvanbruegge]

Describe the solution you'd like

In the timer overview, it would be nice if I could tap on one of the existing alarms to bring up the creation window to edit the timer. Currently I have to remove the timer and add a new one.

Use case

This is useful for one-off timers. I have few timers I use regularly, and one timer for one-offs.

Describe alternatives you've considered

In addition to the "add" button, a "play" button which would create a one-off timer (that does not get saved in the overview) would also work.