fix #8444 - NPE when no WMS url is entered in WMS add dialog + various UI improvements in add WMS/TMS dialogs (OK button enabled status is dynamic, new Help button, name suggested for wms_endpoint)

git-svn-id: http://josm.openstreetmap.de/svn/trunk@5731 0c6e7542-c601-0410-84e7-c038aed88b3b
fix #4664 - Add new tags for directional tags

git-svn-id: http://josm.openstreetmap.de/svn/trunk@5732 0c6e7542-c601-0410-84e7-c038aed88b3b