vf_rotate: support all multiples of 90 degrees

This couldn't rotate by 180°. Add this, and also make the parameter in
degrees, instead of magic numbers.

For now, drop the flipping stuff. You can still flip with --vf=flip or
--vf=mirror. Drop the landscape/portrait stuff - I think this is
something almost nobody will use. If it turns out that we need some of
these things, they can be readded later.

Make it use libavfilter. Its vf_transpose implementation looks pretty
simple, except that it uses slice threading and should be much faster.

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