Connect CalDAV todos to DB-Items, finish todo component and add it to pipeline items

app/Models/PipelineItem.php

@@ -39,4 +39,12 @@ public function notes()
     {
         return $this->morphMany(Note::class, 'notable');
     }
+
+    /**
+     * Get the todos
+     */
+    public function todos()
+    {
+        return $this->morphMany(Todo::class, 'todoable');
+    }
 }