Gerbview: very minor fix
(With a minor change for icon_cvpcb.svg: better look on dark backgrounds) Fix bug 668200.
Remove or move old .ico and .pgn files and add new icons (.ico files and .png files) in bitmaps_png/icons and bitmaps_xpm/icons .png files and .ico are used to build desktop shortcuts Handle variable size bitmaps in kicad.