[mkgmap-dev] Commit r4382: code cleanup using hints from sonarlint, no change in output expected

Version mkgmap-r4382 was committed by gerd on Mon, 02 Dec 2019 code cleanup using hints from sonarlint, no change in output expected - remove dead code, remove redundant specification of type arguments, reformatting - make some fields final - make some methods static - add method Way.calcLengthInMetres and use it in LengthFunction, SeaGenerator, and LinkDestinationHook http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4382