[TASK] Make LFEditor work under PHP 5

LFEditor is available for TYPO3 7.6. That implies, it works under PHP 5.5. Unfortunately it doesn’t, because of some type hints in the PHP code. A feature that is only available since PHP 7.

Classes/Service/ConfigurationService.php

@@ -77,7 +77,7 @@ class ConfigurationService extends AbstractService {
 	 * @return array
 	 * @throws \InvalidArgumentException
 	 */
-	public function prepareConfig(): array {
+	public function prepareConfig() {
 		if (!empty($this->extConfig)) {
 			return $this->extConfig;
 		}
@@ -171,7 +171,7 @@ class ConfigurationService extends AbstractService {
 	 * @throws LFException raised if no extensions are found
 	 * @return array
 	 */
-	public function menuExtList(): array {
+	public function menuExtList() {
 		// search extensions
 		$tmpExtList = [];
 		try {