Avoid fast skip in case of inter-layer prediction (same POC): return MAX instead of 0

See merge request jvet/VVCSoftware_VTM!2145

JVET-Y0237: Fix for GCI constraint flags

See merge request jvet/VVCSoftware_VTM!2149

With msg level ERROR the message is printed to stderr

Fix #1524: CRA output when NoOutputBeforeRecoveryFlag = 1

See merge request jvet/VVCSoftware_VTM!2142

multiple fixes for gdr (including #1528 and #1529)

See merge request jvet/VVCSoftware_VTM!2151

Bugfix for bugs 1 and 3 described in Y0190.
With adoption of Y0237 option C, legal bitstreams now and in the future cannot set gci_num_additional_bits to values in the range 1 to 5.
Decoder behaviour if it encounters such values is non-normative.

JVET-Y0155: Fixes and clean up for temporal prefilter

See merge request jvet/VVCSoftware_VTM!2150

Fix #1512: locSumAbs derivation

See merge request jvet/VVCSoftware_VTM!2121

- restore TemporalFilter parameter
- print warning when parameters are outside set that has been
  extensively tested

Remove macros of VTM 15 cycle

See merge request jvet/VVCSoftware_VTM!2153

Fix #1525: don't access sps pointer after potential deletion

See merge request jvet/VVCSoftware_VTM!2143

Rename MTS related variables, fix parameters checking and documentation

See merge request jvet/VVCSoftware_VTM!2148

Fix compile issue with clang 11 compiler

See merge request jvet/VVCSoftware_VTM!2147