[mkgmap-dev] Commit r4378: code cleanup using hints from sonarlint, no change in output expected

Version mkgmap-r4378 was committed by gerd on Tue, 26 Nov 2019 code cleanup using hints from sonarlint, no change in output expected - minor memory footprint improvements (MDR8Record and MDR28Record no longer extend ConfigBase) - remove dead code, remove redundant specification of type arguments - make some fields final - simplify some compareTo methods using Integer.compareTo() - make some methods static http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4378