- refactoring of MatrixIntraPrediction.h/.cpp (merged classes MatrixIntraPrediction and PredictorMIP, removed namespace Mip)
- removed unused variable posBias in function computeReducedPred
- fixed list size in function reduceHadCandList

This reverts commit 9503ca9c

- fixed build error

- Fix for the case that uninitialized or invalid best cost values are referred during search candidate selection

Encoder side bug fix: the encoder speed up in palette (which bypass INTRA mode check in inter slice if palette mode is better than INTER mode)
shouldn't be applied on 4x4 blocks since JVET-N0266 disabled INTER mode in 4x4 blocks.
Without the fix, intra mode will always be skipped in 4x4 blocks in inter slice if IBC is disabled in SPS.

BugFix of encoder deblocking optimization: add initialization of m_ctuXLumaSamples and m_ctuYLumaSamples, align with 4x4 deblocking

Indentation improvements

- This fix is aligned with spec text.

Software changes with respect to the adoption from proposal JVET-O0455:
Control the maximum number of IBC merge candidates independently from
the maximum number of regular merge candidates.