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Add HEVC RefPicSetLtCurr and NumPocLtCurr picture parameters
Corresponds to the variables of same name as defined in section 8.3.2 of the HEVC spec.
The RefPicSetStCurrBefore and RefPicSetStCurrAfter can be derived by sorting them, however there is no defined order for the RefPicSetLtCurr and thus it must be provided explicitly.
This is needed for AMD driver and also to match the DXVA and Vulkan Video interfaces.