Cleanup: fix return type of PPS::getMixedNaluTypesInPicFlag

See merge request jvet/VVCSoftware_VTM!2011

Return bool since variable is a boolean. Also fix use of returned
values.

Fix #1457: rplIdx variable for list 1 is not always set in parseSliceHeader()

See merge request jvet/VVCSoftware_VTM!2010

Fix #1456: Incorrect DPB flush when mixed NALU types is enabled

See merge request jvet/VVCSoftware_VTM!2009

Fix #1453: use 64-bit variables for RPR to prevent overflow

See merge request jvet/VVCSoftware_VTM!2008

Overflow may occur in corner cases in large pictures.
Added const modifiers where appropriate.
Defined additional variables to hold intermediate values to avoid
code duplication.
Rename variables to more closely match VVC specification.

Fix #1452: use "true" original for HDR metrics

See merge request !2007

Fix #1451: Align SW with spec for RPR/4:4:4 combination

See merge request jvet/VVCSoftware_VTM!2006

Modify interpolation filter function such that, when processing a
chroma block, the fractional displacement is always expressed in
units of 1/32nd of a chroma sample.

JVET-U2018: Updated configuration file for HBD CTC

See merge request jvet/VVCSoftware_VTM!2005

JVET-U0103: SIMD implementation for high bit depth coding

See merge request !1999

Refactor: rename ALF APS ID related functions and variables

See merge request !2001

JVET-U0081: ALF filter optimization with filter strength target

See merge request !2000

- make clear that function handles APS IDs (in contrast to APS pointers)
- remove deprecated 'TileGroup' name parts
- improve alignment with syntax element names

Fix indentation and braces

See merge request !1998

Fix indentation and braces

See merge request !1997

Fix indentation and braces

See merge request !1996

Fix indentation and braces

See merge request !1995

Fix indentation and braces

See merge request !1994

Fix indentation and braces

See merge request !1993

Removed unused code from xRecurIntraCodingLumaQT

See merge request !1992

Fix indentation and braces

See merge request !1991

Remove unused functions

See merge request !1990