Milestone 19

This release includes:

• General
  • Upgrade of log4j version to 2.17.0
  • Upgrade of xmlgraphics-commons version to 2.6
  • Minor dependencies fixes
• CIPs
  • Accept CIP2021-07-07 Grouping key and aggregation expressions
  • Accept CIP2021-08-10 Operator precedence
  • Adjustment of CIP2015-05-13 EXISTS to grammar refactorings
• TCK, TCK API, and TCK tools
  • Update TCK scenarios to reflect CIP2021-07-07 Grouping key and aggregation expressions, primarily in TCK features Return6, ReturnOrderBy6, With6, and WithOrderBy4
  • Add TCK scenarios to reflect CIP2021-08-10 Operator precedence
  • Remove deprecated syntax from TCK scenarios, specifically
    • Octal number syntax starting with 0 instead of 0o
    • No coercion of lists to boolean
  • Add scenarios to TCK feature WithSkipLimit3
  • Update scenario in TCK feature List6 to avoid introducing variable in pattern predicate
  • Fix hashcode bug in TCK API class CypherLists
  • Speed up of TCK integrity tests
• Grammar and grammar tools
  • Add antlr parser demo
  • Grammar refactorings
    • Add <PatternPredicate> ::= <RelationshipsPattern> for clearer distinction of <RelationshipsPattern> appearing as an <Atom>
    • Add separate production of s for better referencing and separation of quantifiers in the grammar
  • Add functionality to the grammar toolkit, e.g. praising of ISO WG3 BNF
  • Fix bug in grammar non-terminal <UnaryAddSubtractExpression>
  • Remove use of a deprecated antlr class