add application/gpx+xml to accepted MIME types
add application/gpx+xml to accepted MIME types

rsudev/c-geo-opensource,matej116/cgeo,cgeo/cgeo,cgeo/cgeo,matej116/cgeo,tobiasge/cgeo,rsudev/c-geo-opensource,cgeo/cgeo,matej116/cgeo,cgeo/cgeo,rsudev/c-geo-opensource,tobiasge/cgeo,tobiasge/cgeo