lavu: add av_clipd_c

Signed-off-by: Paul B Mahol <onemda@gmail.com>
colorbalance filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>
colorchannelmixer filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>
svq3: use memmove to avoid overlap in memcpy.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>