Change cache touch parameter to invalidate, added CLI option for it

CHANGELOG.md

@@ -10,6 +10,7 @@
     * Fixed Assets options array mixed with standalone priority [#2477](https://github.com/getgrav/grav/issues/2477)
     * Fix for `avatar_url` provided by 3rd party providers
     * Fixed non standard `lang` code lengths in `Utils` and `Session` detection
+    * Fixed saving a new object in Flex `SimpleStorage`
 
 # v1.6.8
 ## 04/23/2019

system/src/Grav/Framework/Flex/Storage/SimpleStorage.php

@@ -192,6 +192,9 @@ class SimpleStorage extends AbstractFilesystemStorage
 
         $list = [];
         foreach ($rows as $key => $row) {
+            if (strpos($key, '@@')) {
+                $key = $this->getNewKey();
+            }
             $this->data[$key] = $list[$key] = $row;
         }