[BUGFIX] Keep the global namespace clean in ext_localconf.php (#39)

Move the plugin registration into a function.

CHANGELOG.md

@@ -46,6 +46,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - Drop the dependency of `roave/security-advisories`
 
 ### Fixed
+- Keep the global namespace clean in `ext_localconf.php` (#40)
 - Update the badge URLs in the README (#29, #22)
 - Fix code inspection warnings
 - Use the new annotations for lazy loading

ext_localconf.php

@@ -1,6 +1,9 @@
 <?php
-// This makes the plugin available for front-end rendering.
-\TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
+defined('TYPO3_MODE') or die('Access denied.');
+
+(static function () {
+    // This makes the plugin available for front-end rendering.
+    \TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
         // extension name, exactly matching the PHP namespaces (vendor and product)
         'TTN.Tea',
         // arbitrary, but unique plugin name (not visible in the BE)
@@ -13,4 +16,5 @@
         [
             'Tea' => '',
         ]
-);
+    );
+})();