Hi,

This adds generic hwupload and hwdownload filters.  The device for hwupload 
comes from a new field in the AVFilterContext, while hwdownload just works with 
the HW frames context is gets from the incoming link.

avconv adds support for setting the device for vaapi (via a new -vaapi_device 
option), though it doesn't yet work to pass HW frames straight from a hwaccel 
decoder (more graph setup weirdness to chase).

The VAAPI scale filter (renamed "scale_vaapi") has been modified to only work 
on hardware surfaces; it needs to be combined with hwupload or hwdownload to 
work on normal frames.

Thanks,

- Mark
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