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Fix ALF Issues

Brian Heng requested to merge bheng/VVCSoftware_VTM:fix_alf_issues into master

  • N0242 Non-linear ALF increased SIMD processing size from 4 to 8 pixels. This can cause some processed area to be outside the picture. Checking whether these out-of-bounds blocks are PCM-coded currently crashes the decoder because the CU is NULL.

  • N0180 Vitrual Boundary behavior is different at bottom of picture if picture is only 1 CTU high. Suggest disabling virtual boundary at bottom of picture (as is currently done for >1 CTU high pictures). Increased bottom edge VB condition by 4 pixels to ensure this disables it, even for 1 CTU high pictures.

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