There are circumstances where the flag isn't set but the skip mode
frames are. So don't use the inferred bit which has other inputs
when deciding to pass the skip mode frames to the device.

This fixes some decoding bugs on intel av1

Thanks to Dave Airlie for figuring out a lot of the parameters.

Thanks to Dave Airlie for figuring out a lot of the parameters.

For compatibility with vf_libplacebo

For two reasons:
1. We now create a vulkan 1.3 device
2. libplacebo master currently requires a vulkan 1.3 device

For thread safety.

The temporary AVFrame on staack enables us to use the common
dependency/dispatch code in prepare_frame().
The prepare_frame() function is used for both frame initialization
and frame import/export queue family transfer operations.
In the former case, no AVFrame exists yet, so, as this is purely
libavutil code, we create a temporary frame on stack. Otherwise,
we'd need to allocate multiple frames somewhere, one for each
possible command buffer dispatch.

The idea was that it's faster to map linear images and copy them
via regular memcpy. This is a very niche use, plus very inconsistently
useful, as it would only really be faster on a few Intel GPUs.
Even then, using the non-cached memcpy would've been better.

Instead, scrap this code. Drivers are better at figuring out
what copy to use, and if we're host-mapping, it should actually be
just as fast, if not faster.

This commit adds proper handling of multiplane images throughout
all of the hwcontext code. To avoid breakage of individual
components, the change is performed as a single commit.

This commit rewrites the majority of vulkan.c to enable its use
as a general-purpose high-level utility code, usable for decoding,
encoding, and filtering of video frames.

The dependency system was rewritten to simplify management of
execution.

The image handling system was rewritten to accomodate multiplane
images.

Due to how related all the new features were, this is a single
commit.