Ref T135, utility functions for platform guessing and channels

* using QSet
* platform guessing
* Doxygen
* word size in CBuildConfig
* renamed to BlackMisc::Db::TDistributionsInfo

src/blackconfig/buildconfig.h

@@ -137,6 +137,17 @@ namespace BlackConfig
         //! Turns build timestamp into a version number
         static int buildTimestampAsVersionSegment(const QDateTime &buildTimestamp);
 
+        //! Build ABI parts as in http://doc.qt.io/qt-5/qsysinfo.html#buildAbi
+        static const QStringList &getBuildAbiParts();
+
+        //! Whether this swift application is build as 32 or 64bit application
+        //! \returns 32, 64 or -1 (in case no info is possible)
+        static int buildWordSize();
+
+        //! The platform string used for updates etc.
+        //! \remark ideally no such guess would be needed, but it is used as default value
+        static QString guessMyPlatformString();
+
     private:
         //! Major version
         static int versionMajor(); // defined in buildconfig_gen.cpp.in