[mkgmap-dev] Commit r4464: merge the is-in branch

Version mkgmap-r4464 was committed by gerd on Sat, 07 Mar 2020 merge the is-in branch - adds the new style function is_in(), see style documentation for details. - the ResidentialHook is disabled if the style doesn't explicitely use mkgmap:residential http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4464