Kimai, time grid

[HeinzWuert]

Is your feature request related to a problem? Please describe.
Here is a brief explanation as requested.
A time grid can be defined in the Kimai settings, which corrects all time entries for this grid. In Kimai, this also has a direct impact on the calendar, which allows entries to be made in the specified grid when recording time.
Accordingly, a new time picker would have to adopt this grid from the definition of the setting.
For example, we use a 15 minute grid. In the calendar this is shown as 09:00, 09:15, 09:30 etc.
This means that you no longer have to round.
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