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/context.h

@@ -6,7 +6,6 @@
 #ifndef BLACKMISC_CONTEXT_H
 #define BLACKMISC_CONTEXT_H
 
-#include "blackmisc/debug.h"
 #include <QMetaType>
 #include <QObject>
 #include <QMap>
@@ -161,25 +160,6 @@ namespace BlackMisc
          * \return
          */
         virtual const QString &getApplicationName() const = 0;
-
-        /*!
-         * Return the CDebug object.
-         * \return
-         * \throw std::logic_error The requested object is not present.
-         */
-        CDebug &getDebug()
-        {
-            return getObject<CDebug>();
-        }
-
-        /*!
-         * Set the CDebug object.
-         * \param debug
-         */
-        void setDebug(CDebug &debug)
-        {
-            setObject(debug);
-        }
     };
 
     /*!