Check-in rules: Allow to check for time of day (#2061)

* Add "customtime" option

* Fix time picker output format

* Fix bug in bool_alg

* Fix test

src/pretix/static/pretixcontrol/js/ui/checkinrules.js

@@ -99,7 +99,8 @@ $(document).ready(function () {
           date_from: gettext('Event start'),
           date_to: gettext('Event end'),
           date_admission: gettext('Event admission'),
-          date_custom: gettext('custom time'),
+          date_custom: gettext('custom date and time'),
+          date_customtime: gettext('custom time'),
           date_tolerance: gettext('Tolerance (minutes)'),
           condition_add: gettext('Add condition'),
           minutes: gettext('minutes'),
@@ -119,4 +120,4 @@ $(document).ready(function () {
       },
     }
   })
-});
+});