[josm_plugins] fix #8987 - bump min JOSM version of nearly all plugins to r6162 + code update/cleanup, fix warnings

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29854 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
[josm_cadastre-fr] fix build.xml

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29855 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
[josm_plugins] fix common build.xml

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29856 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
[josm_plugins] svn ignore of build directories

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29858 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4