per-board "Emphasize due date" with global default (v1.4)

Template/config/show.php

@@ -33,6 +33,13 @@
         </p>
     </fieldset>
 
+    <fieldset>
+        <?= $this->form->checkbox('organon_tweaks_emphasize_duedate_default', t('Emphasize due date by default'), 1, isset($values['organon_tweaks_emphasize_duedate_default']) && $values['organon_tweaks_emphasize_duedate_default'] == 1) ?>
+        <p class="form-help">
+            <?= t('Default for boards set to "Use default": enlarge and bold the due date on the board. Each board can override this under its own Settings -> Integrations.') ?>
+        </p>
+    </fieldset>
+
     <div class="form-actions">
         <button type="submit" class="btn btn-blue"><?= t('Save') ?></button>
     </div>