changes in Extensions ABI

* rewrite aggregator to normal qt ui
* use X-AW prefix for formatters options
* fix logging
* use nullptr in headers

sources/awesomewidgets/extitemaggregator.h

@@ -57,7 +57,7 @@ public:
     void editItems()
     {
         repaintList();
-        int ret = dialog->exec();
+        int ret = exec();
         qCInfo(LOG_LIB) << "Dialog returns" << ret;
     };