The variable invAngle in the VVC specification is signed, whereas
the variable in the software is unsigned.

renamed the getWideAngleIntraMode function as well

1) The getWideAngle function has been renamed to getModifiedWideAngle.
2) A comment has been added inside this function to explicitly mark the behavior.

Assign correct default values (1) to collocated chroma flags in
SPS. Note that default values are used only for non-420 chroma formats.
Modify and clean up CCLM code to not unnecessarily rely on collocated
chroma flags for non-420 chroma formats.

- Macro: JVET_Q0293_REMOVAL_PDPC_CHROMA_NX2