Add per-project and per-swimlane task limits

This change allows projects and swimlanes to be configured with task limits that apply to their whole scope (i.e. all active tasks in a project or swimlane, respectively), as opposed to the usual per-column task limits.

app/Template/swimlane/table.php

@@ -4,6 +4,7 @@
     <thead>
         <tr>
             <th><?= t('Name') ?></th>
+            <th class="column-15"><?= t('Task limit') ?></th>
             <th class="column-15"><?= t('Open tasks') ?></th>
             <th class="column-15"><?= t('Closed tasks') ?></th>
         </tr>
@@ -43,6 +44,9 @@
                     <?= $this->app->tooltipMarkdown($swimlane['description']) ?>
                 <?php endif ?>
             </td>
+            <td>
+                <?= $swimlane['task_limit'] > 0 ? $swimlane['task_limit'] : '∞' ?>
+            </td>
             <td>
                 <?= $swimlane['nb_open_tasks'] ?>
             </td>