Remove obsolete logging framework

This changes removes classes of the obsolete logging frame work and
all its references. It was not used anywhere, but included in several
headers.
Had to add header QDateTime in some places, which was not correctly
included and now missing.

refs #90

src/blackmisc/valueobject.h

@@ -1,7 +1,6 @@
 #ifndef BLACKMISC_VALUEOBJECT_H
 #define BLACKMISC_VALUEOBJECT_H
 
-#include "blackmisc/debug.h"
 #include <QtDBus/QDBusMetaType>
 #include <QString>
 #include <QtGlobal>
@@ -69,18 +68,6 @@ namespace BlackMisc
             return stream;
         }
 
-        /*!
-         * \brief Stream operator << for log messages
-         * \param log
-         * \param uc
-         * \return
-         */
-        friend CLogMessage operator<<(CLogMessage log, const CValueObject &uc)
-        {
-            log << uc.stringForStreaming();
-            return log;
-        }
-
         /*!
          * \brief Stream operator << for std::cout
          * \param ostr