First draft for plugins system

app/Template/header.php

@@ -0,0 +1,33 @@
+<header>
+    <nav>
+        <h1><?= $this->url->link('K<span>B</span>', 'app', 'index', array(), false, 'logo', t('Dashboard')).' '.$this->e($title) ?>
+            <?php if (! empty($description)): ?>
+                <span class="tooltip" title='<?= $this->e($this->text->markdown($description)) ?>'>
+                    <i class="fa fa-info-circle"></i>
+                </span>
+            <?php endif ?>
+        </h1>
+        <ul>
+            <?php if (isset($board_selector) && ! empty($board_selector)): ?>
+            <li>
+                <select id="board-selector"
+                        class="chosen-select select-auto-redirect"
+                        tabindex="-1"
+                        data-notfound="<?= t('No results match:') ?>"
+                        data-placeholder="<?= t('Display another project') ?>"
+                        data-redirect-regex="PROJECT_ID"
+                        data-redirect-url="<?= $this->url->href('board', 'show', array('project_id' => 'PROJECT_ID')) ?>">
+                    <option value=""></option>
+                    <?php foreach($board_selector as $board_id => $board_name): ?>
+                        <option value="<?= $board_id ?>"><?= $this->e($board_name) ?></option>
+                    <?php endforeach ?>
+                </select>
+            </li>
+            <?php endif ?>
+            <li>
+                <?= $this->url->link(t('Logout'), 'auth', 'logout') ?>
+                <span class="username hide-tablet">(<?= $this->user->getProfileLink() ?>)</span>
+            </li>
+        </ul>
+    </nav>
+</header>