avfilter/vf_libplacebo: composite multiple inputs in linear light

This gives vastly improved blending results than when blending directly in
the desired output colorspace. Overridable by the existing "disable_linear"
option.

This is functionally similar to combining multiple "libplacebo" filters,
but does not rely on the existence of a Vulkan filter link, so it can be used
without performance penalty in all circumstances. It's also enabled by
default, without requiring special action from the user.

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