Making metaboxes interact with redux.

Making metaboxes properly interact with redux. Observer state changes in
metaboxes to mark state as dirty etc. Only save a metabox if it has
changed.

Author: BE-Webdesign

assets/css/metabox.css

@@ -145,3 +145,7 @@ textarea {
 .acf_postbox .inside {
 	padding: 15px !important;
 }
+
+#post {
+	margin: 0;
+}