avfilter/uspp: misc style fixes
avfilter/uspp: make src const in store_slice_c()
avfilter/uspp: use AVFILTER_DEFINE_CLASS()
build: add forgotten avcodec dependency in uspp
LICENSE: mention that uspp is GPL
avfilter/version: bump for uspp

Found-by: ubitux
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/vf_uspp: Allocate qp storage after qp_stride is known

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/vf_uspp: The qp array width is qp_stride not stride/16

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/vf_uspp: use the average QP instead of QP[0]

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/vf_uspp: remove YUV 411/422/440

snow doesnt support 422/411/440 currently, so these do not work yet

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