PropertyBrowser: rename POINTF_PROPERTY x/y to lon/lat
Similar to the revised RECTF_LONLAT_PROPERTY, POINTF_PROPERTY should display "lon" and "lat" in the property browser instead of x/y.
Similar to the revised RECTF_LONLAT_PROPERTY, POINTF_PROPERTY should display "lon" and "lat" in the property browser instead of x/y.