Add a setting to preselect "All day"

Problem/Motivation

Add a setting to preselect "All day". In some cases it's just the default and user should not need to check it each time, but uncheck it if needed.

Would be great to have a setting for that, dependent on the "All day" option being enabled.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes