Add four-column grid container

public/typo3conf/ext/ep_theme/Configuration/TCA/Overrides/tt_content_element_container.php

@@ -27,6 +27,19 @@ call_user_func(function () {
         )
     );
 
+    \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\B13\Container\Tca\Registry::class)->configureContainer(
+        new \B13\Container\Tca\ContainerConfiguration(
+            'ep_container_quarters',
+            'Vierspalter',
+            '25/25/25/25 Aufteilung',
+            [
+                [
+                    ['name' => 'Elemente', 'colPos' => 300],
+                ]
+            ]
+        )
+    );
+
     \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\B13\Container\Tca\Registry::class)->configureContainer(
         new \B13\Container\Tca\ContainerConfiguration(
             'ep_container_teasergroup',
@@ -56,7 +69,7 @@ call_user_func(function () {
         '
     ];
 
-    foreach (['ep_container_halves', 'ep_container_thirds', 'ep_container_teasergroup'] as $field) {
+    foreach (['ep_container_halves', 'ep_container_thirds', 'ep_container_quarters', 'ep_container_teasergroup'] as $field) {
         $GLOBALS['TCA']['tt_content']['types'][$field] = array_replace_recursive(
             $GLOBALS['TCA']['tt_content']['types'][$field],
             $headerConfig

public/typo3conf/ext/ep_theme/Configuration/TypoScript/ContentElements/container.typoscript

@@ -20,6 +20,17 @@ tt_content.ep_container_thirds {
     }
 }
 
+tt_content.ep_container_quarters =< lib.contentElement
+tt_content.ep_container_quarters {
+    templateName = Quarters
+    templateRootPaths {
+        10 = EXT:ep_theme/Resources/Private/Templates/Container
+    }
+    dataProcessing {
+        100 = B13\Container\DataProcessing\ContainerProcessor
+    }
+}
+
 tt_content.ep_container_teasergroup =< lib.contentElement
 tt_content.ep_container_teasergroup {
     templateName = Teasergroup