improved duration and minute selector (#2264)

* do not close modal if form is dirty
* deprecated TimesheetConfiguration
* inject timezone in form types
* cleanup usage of UserDateTimeFactory
* allow to configure increment steps for minutes
* use 15 minutes step for datetimepicker in project edit form
* use rounding rules for increments in minute select for begin and end
* allow duration in multi user and admin timesheet forms
* make dropdown values configurable

tests/Controller/CalendarControllerTest.php

@@ -71,6 +71,7 @@ class CalendarControllerTest extends ControllerBaseTest
             ],
             'timesheet' => [
                 'default_begin' => '08:30:00',
+                'mode' => 'default'
             ],
             'calendar' => [
                 'businessHours' => [