add asText override to title and text property

Author: johguentner

src/Entities/Properties/Text.php

@@ -69,6 +69,14 @@ protected function fillText(): void
         $this->plainText = $this->content->getPlainText();
     }
 
+    /**
+     * @return string
+     */
+    public function asText(): string
+    {
+        return $this->getPlainText();
+    }
+
     /**
      * @return RichText
      */

src/Entities/Properties/Title.php

@@ -68,6 +68,14 @@ private function fillText(): void
         $this->plainText = $this->content->getPlainText();
     }
 
+    /**
+     * @return string
+     */
+    public function asText(): string
+    {
+        return $this->getPlainText();
+    }
+
     /**
      * @return RichText
      */