Refactor 'Weekwidget with exceptions' as Widget of Widgets

This task is now completed.

The last (small) commit moves the Weekdays into its own wrapper, to be more consistent with other widgets for Exceptions and (to-be, future) seasons. The HTML looks the same, so I expect no backward compatibility problems.

diff --git a/src/Plugin/Field/FieldWidget/OfficeHoursExceptionsWeekWidget.php b/src/Plugin/Field/FieldWidget/OfficeHoursExceptionsWeekWidget.php
index 5fab51f..4424792 100644
--- a/src/Plugin/Field/FieldWidget/OfficeHoursExceptionsWeekWidget.php
+++ b/src/Plugin/Field/FieldWidget/OfficeHoursExceptionsWeekWidget.php
@@ -36,7 +36,9 @@ class OfficeHoursExceptionsWeekWidget extends OfficeHoursWeekWidget {
     }
 
     // First, create a Week widget for the normal weekdays.
-    $element = parent::formElement($items, $delta, $element, $form, $form_state);
+    // Using the form were are in already, not by adding a new widget.
+    $field_type = 'office_hours';
+    $element["$field_type"] = parent::formElement($items, $delta, $element, $form, $form_state);
     $items->filterEmptyItems();
 
     // Then, add a List Widget for the Exception days.

Automatically closed - issue fixed for 2 weeks with no activity.

Making a final adjustment, having all 3 widgets in a separate array.

Automatically closed - issue fixed for 2 weeks with no activity.