[TASK] Replace $_EXTKEY with extension string

ext_tables.php

@@ -4,31 +4,31 @@ if (!defined('TYPO3_MODE')) {
 }
 
 \TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerPlugin(
-    $_EXTKEY,
+    'typo3_roadmap',
     'Roadmap',
     'TYPO3 Roadmap'
 );
 
 \TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerPlugin(
-    $_EXTKEY,
+    'typo3_roadmap',
     'Features',
     'TYPO3 Features'
 );
 
 \TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerPlugin(
-    $_EXTKEY,
+    'typo3_roadmap',
     'Featureshowrecords',
     'TYPO3 Features Show Records'
 );
 
 \TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerPlugin(
-    $_EXTKEY,
+    'typo3_roadmap',
     'Featureareashowrecords',
     'TYPO3 Feature Area Show Records'
 );
 
 \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addStaticFile(
-    $_EXTKEY,
+    'typo3_roadmap',
     'Configuration/TypoScript',
     'TYPO3 Roadmap'
 );