[mkgmap-dev] Commit r4549: code simplification (osmstyle), no functional change intended

Version mkgmap-r4549 was committed by gerd on Tue, 16 Jun 2020 code simplification (osmstyle), no functional change intended - move common code in toString() methods to calcValueBuildersString(), it is only used when debugging - remove commented or dead code and some TODO statements - add @override - various other small changes suggested by sonarlint http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4549