Indentation improvements

Move DPDC code for HOR/VER to xPredIntraAng function to be
consistent with other angular modes. This also avoids code
duplication by having the same PDPC code for HOR and VER modes.

Clipping is not required for the DC/Planar PDPC process since
the result is always within the valid range

Remove fields whRatio and hwRatio from the IntraPredParam
structure when JVET_O0364_PADDING is enabled as they may be needed
only once. When ratios are needed use logs, adds, and shifts
instead of divisions and multiplications.

Add initializer for angularScale when JVET_O0364_PDPC_ANGULAR is
enabled

Make life easier for the auto-vectorizer.
2% runtime decrease for AI in limited tests

Not sure how this got here. Was it added after automated
macro removal?

If we don't even store the VPS at the decoder, at least properly delete it.

- 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.