[TASK] Use phpspreadsheet consistently

- raise version numbers
- suggest the direct use of `phpoffice/phpspreadsheet` via composer
- suggest `EXT:base_excel` for legacy installations
- test for class existence of PhpSpreadSheet

Related: #1214
Related: #1208

Classes/Controller/AbstractController.php

@@ -16,7 +16,6 @@
 use TYPO3\CMS\Core\Configuration\Exception\ExtensionConfigurationExtensionNotConfiguredException;
 use TYPO3\CMS\Core\Configuration\Exception\ExtensionConfigurationPathDoesNotExistException;
 use TYPO3\CMS\Core\EventDispatcher\EventDispatcher;
-use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Extbase\Mvc\Controller\ActionController;
 use TYPO3\CMS\Extbase\Mvc\Exception\NoSuchArgumentException;
@@ -110,7 +109,7 @@ public function __construct(
         $this->uploadService = $uploadService;
         $this->eventDispatcher = $eventDispatcher;
 
-        $this->isPhpSpreadsheetInstalled = ExtensionManagementUtility::isLoaded('base_excel');
+        $this->isPhpSpreadsheetInstalled = class_exists(\PhpOffice\PhpSpreadsheet\IOFactory::class);
     }
 
     /**

composer.json

@@ -39,8 +39,8 @@
 		"ext-curl": "*"
 	},
 	"suggest": {
-		"sjbr/static-info-tables": "*",
-		"jambagecom/base-excel": "^v1.29.0"
+		"sjbr/static-info-tables": "Provides country information for the country field",
+		"phpoffice/phpspreadsheet": "Enables xlsx export via the powermail module"
 	},
 	"replace": {
 		"typo3-ter/powermail": "self.version"

ext_emconf.php

@@ -19,6 +19,7 @@
         'conflicts' => [
         ],
         'suggests' => [
+            'base_excel' => '',
             'static_info_tables' => ''
         ],
     ],