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Refactoring of HPMV (history based marge candidates), moving the LUTs from Slice to CodingStructure

Adam Wieckowski requested to merge adam_wieckowski/VVCSoftware_VTM:refactor_hpmv into master

In order to ever be able to support some kind of sub-slice level parallelization (see #201), the Slice object cannot hold values which change during the encoding of a slice (this is more or less equivalent to using global variables).

In this MR, HPMV LUTs are refactored from Slice to CodingStructure.

I tested 49fr for all but A classes and the results are as expected 0%/0%/0% BD-Y/Cb/Cr 100%/100% EncT/DecT.

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