using namespace in header removed, rectified resulting changes

* using namespace in context_runtime.h
* in same step also fixed some other using namespace issues

src/blackgui/components/logcomponent.cpp

@@ -11,6 +11,7 @@
 #include "ui_logcomponent.h"
 #include "../stylesheetutility.h"
 
+using namespace BlackMisc;
 using namespace BlackGui;
 
 namespace BlackGui