JVET-S0221: Constraints on the number of virtual boundaries

added 118 commits

• 824f3ab0...ffa9403d - 117 commits from branch jvet:master
• f9d668f2 - Merge branch 'master' into 'JVET-S0221'

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It may be beneficial to additionally add a config file parameter check for the encoder. It may be complicated for the user to trace back, which options caused the problem, when a constraint on syntax elements fails.

added 2 commits

• 39f5c659 - JVET-S0221: Constraints on the numbers of virtual boundaries
• c05ae257 - JVET-S0221: Fix bugs, resolve conflict, and add one check at configure

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resolved all threads

merged

mentioned in commit aaab9269