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/Twig/Runtime/ThemeEventExtensionTest.php

@@ -50,6 +50,6 @@ class ThemeEventExtensionTest extends TestCase
     {
         $sut = $this->getSut();
         $values = $sut->getJavascriptTranslations();
-        self::assertCount(23, $values);
+        self::assertCount(24, $values);
     }
 }