cuvid: Add hwaccels and decoders for remaining supported formats

cuvid/nvdecode also supports mpeg1, mpeg2, h.263/mpeg4-asp and mjpeg.

It should, in theory, also support wmv3 via the vc1 support, given
that vdpau supports this. However, it failed to play wmv3 samples
which vdpau played correctly, so I'm not sure what to make of it.

Signed-off-by: Philip Langdale <philipl@overt.org>
Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>
