Deprecate Addon::DIRECTORY in favor of AddonHelper::getAddonPath()

src/Core/Addon/AddonHelper.php

@@ -14,6 +14,13 @@ namespace Friendica\Core\Addon;
  */
 interface AddonHelper
 {
+	/**
+	 * Returns the absolute path to the addon folder
+	 *
+	 * e.g. `/var/www/html/addon`
+	 */
+	public function getAddonPath(): string;
+
 	/**
 	 * Returns the list of available addons with their current status and info.
 	 * This list is made from scanning the addon/ folder.