lavfi/stereo3d: subsampled yuv support for non-anaglyph outputs

Signed-off-by: Paul B Mahol <onemda@gmail.com>
MAINTAINERS: drop 1.1 from the releases that i maintain

There seems to be no need to continue maintaining it, people can easily
upgrade to 1.2

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>