fix compilation errors by code merging and harmonize with JVET_O0119_BASE_PALETTE_444, JVET_O0502_ISP_CLEANUP, JVET_O0472_LFNST_SIGNALLING_LAST_SCAN_POS, JVET_O0545_MAX_TB_SIGNALLING

- only cu_qp_delta is conditioned by (CbWidth > 64 || CbHeight > 64)
- move parsing of tu_joint_cbcr_residual_flag[] between cu_chroma_qp_offset_idx and transform_skip_flag instead of before cu_qp_delta

- 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.

- Macro: JVET_O0213_RESTRICT_LFNST_TO_MAX_TB_SIZE
- Restriction of LFNST to be applied up-to max. TB size

1. indentation
2. function naming
3. Class declaration positions

initial commit of JVET_O0119_BASE_PALETTE_444: palette in HEVC and palette mode coding in JVET-N0258