refs #91 & #124 doxygen fixes, style/comment changes, typos, and override / nullptr keywords

Remark: Doxygen <70 warnings

src/blackmisc/blackmiscfreefunctions.h

@@ -169,7 +169,7 @@ namespace BlackMisc
     /*!
      * \brief Calculate a single hash value based on a list of individual hash values
      * \param values
-     * \param classTypeId   add a hash value for class name on top
+     * \param className   add a hash value for class name on top
      * \return
      */
     uint calculateHash(const QList<uint> &values, const char *className);