add Uninstaller feature

src/Uninstall.php

@@ -0,0 +1,72 @@
+<?php
+/**
+ * @brief fac, a plugin for Dotclear 2
+ *
+ * @package Dotclear
+ * @subpackage Plugin
+ *
+ * @author Jean-Christian Denis and Contributors
+ *
+ * @copyright Jean-Christian Denis
+ * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ */
+declare(strict_types=1);
+
+namespace Dotclear\Plugin\fac;
+
+use dcCore;
+use dcNsProcess;
+use Dotclear\Plugin\Uninstaller\Uninstaller;
+
+class Uninstall extends dcNsProcess
+{
+    public static function init(): bool
+    {
+        static::$init = defined('DC_CONTEXT_ADMIN');
+
+        return static::$init;
+    }
+
+    public static function process(): bool
+    {
+        if (!static::$init || !dcCore::app()->plugins->moduleExists('Uninstaller')) {
+            return false;
+        }
+
+        Uninstaller::instance()
+            ->addUserAction(
+                'settings',
+                'delete_all',
+                My::id()
+            )
+            ->addUserAction(
+                'plugins',
+                'delete',
+                My::id()
+            )
+            ->addUserAction(
+                'versions',
+                'delete',
+                My::id()
+            )
+            ->addDirectAction(
+                'settings',
+                'delete_all',
+                My::id()
+            )
+            ->addDirectAction(
+                'plugins',
+                'delete',
+                My::id()
+            )
+            ->addDirectAction(
+                'versions',
+                'delete',
+                My::id()
+            )
+        ;
+
+        // no custom action
+        return false;
+    }
+}