feat(main): Add slider block type

upgrade/upgrade-1.17.0.php

@@ -0,0 +1,21 @@
+<?php
+
+if (!defined('_PS_VERSION_')) {
+    exit;
+}
+
+function upgrade_module_1_17_0($module)
+{
+    $existing = Db::getInstance()->executeS(
+        'SHOW COLUMNS FROM `' . _DB_PREFIX_ . 'ws_customhtml` LIKE \'slider_mode\''
+    );
+
+    if (!empty($existing)) {
+        return true;
+    }
+
+    return Db::getInstance()->execute(
+        'ALTER TABLE `' . _DB_PREFIX_ . 'ws_customhtml`
+         ADD COLUMN `slider_mode` VARCHAR(16) NOT NULL DEFAULT \'always\' AFTER `timeout`'
+    );
+}