[mkgmap-dev] Commit r3870: code cleanup, no functional change: reduce duplicated code for different OSM formats, get rid of PrecompSeaElementSaver

Version mkgmap-r3870 was committed by gerd on Mon, 27 Mar 2017 code cleanup, no functional change: reduce duplicated code for different OSM formats, get rid of PrecompSeaElementSaver to be continued. There should be no need for classes like Osm5PrecompSeaDataSource or O5mBinBoundaryDataSource, but this needs a rewrite of some interfaces. http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=3870