Issue #77 Break cyclic dependency between CStatusMessage and CStatusException, by removing unused methods

src/blackmisc/statusexception.h

@@ -22,8 +22,6 @@ namespace BlackMisc
 {
     /*!
      * Throwable exception class containing a CStatusMessage.
-     *
-     * This is the exception type which may be thrown by CStatusMessage::maybeThrow().
      */
     class BLACKMISC_EXPORT CStatusException : public std::exception
     {
@@ -46,6 +44,9 @@ namespace BlackMisc
         //! Destructor.
         ~CStatusException() override {}
 
+        //! If the message is not empty then throw it.
+        static void maybeThrow(const CStatusMessage &);
+
     private:
         const CStatusMessage   m_payload;
         mutable QByteArray     m_temp;