Selectors for all start times instead of presets.

From Andrii on 2017/10/01 14:44:23 +0000

Currently start times for “Alert sound start”, “Vibrate after” and similar are set with preset values - 1 3 …12 18 24 minutes, etc. There is no way to set a custom number like 15 minutes which I need for my smart light alarm. Please replace presets with a selector that allows to set any number of minutes. Thanks.

Copied from original feature request: