This adds --video-aspect-method=ignore to replace --video-aspect-override=0.
--video-aspect-override=0 and --video-aspect-override=-1 will no longer be
handled specially. For compatibility, 0 is mapped to always use ignore
and -1 is always mapped to always use container.
"no" is now the replacement for --video-aspect-override=-1, which is
internally remapped to -2 to avoid using a deprecated value.