Issue #11 CEventLoop uses QPointer trick to guard against use-after-free

See https://blogs.kde.org/2009/03/26/how-crash-almost-every-qtkde-application-and-how-fix-it-0

src/blackcore/db/backgrounddataupdater.cpp

@@ -152,7 +152,7 @@ namespace BlackCore::Db
             {
                 // just give the system some time to relax, consolidation is time consuming
                 if (!this->doWorkCheck()) { return; }
-                CEventLoop eventLoop;
+                CEventLoop eventLoop(this);
                 eventLoop.exec(1000);
             }
         }