Add subtasks export and move export actions to a specific controller

app/Template/export/tasks.php

@@ -0,0 +1,24 @@
+<div class="page-header">
+    <h2>
+        <?= t('Tasks exportation for "%s"', $project['name']) ?>
+    </h2>
+</div>
+
+<form method="get" action="?" autocomplete="off">
+
+    <?= $this->formHidden('controller', $values) ?>
+    <?= $this->formHidden('action', $values) ?>
+    <?= $this->formHidden('project_id', $values) ?>
+
+    <?= $this->formLabel(t('Start Date'), 'from') ?>
+    <?= $this->formText('from', $values, $errors, array('required', 'placeholder="'.$this->inList($date_format, $date_formats).'"'), 'form-date') ?><br/>
+
+    <?= $this->formLabel(t('End Date'), 'to') ?>
+    <?= $this->formText('to', $values, $errors, array('required', 'placeholder="'.$this->inList($date_format, $date_formats).'"'), 'form-date') ?>
+
+    <div class="form-help"><?= t('Others formats accepted: %s and %s', date('Y-m-d'), date('Y_m_d')) ?></div>
+
+    <div class="form-actions">
+        <input type="submit" value="<?= t('Execute') ?>" class="btn btn-blue"/>
+    </div>
+</form>