7.1.1: Yield expression fixes

• Fixed yield without expression in various situations - @thekid

7.1.0: PHP enum support

• Merged PR #23: Add syntactic support for PHP 8.1 enums. Implementation
  in the compiler is in pull request xp-framework/compiler#106
  (@thekid)

7.0.4: Standalone operator fix

• Fixed Call to undefined method ::emitoperator() caused by standalone
  operators, see xp-framework/compiler#105
  (@thekid)

7.0.3: Match expressions fix

• Fixed children() accessor for match expressions and conditions, see
  xp-framework/compiler#101
  (@thekid)
• Fixed PHP 8.1 compatiblity by ensuring we do not pass NULL to strlen()
  (@thekid)

7.0.2: Argument parser fix

• Fixed argument parser to queue correctly when handling ambiguity between
  named arguments and global constants (see xp-framework/compiler#98)
  (@thekid)

7.0.1: Braces fix

• Fixed xp-framework/compiler#98: (fstat(STDOUT)) causes a parse error
  (@thekid)

7.0.0: Extended match statement, cleanup & performance

• Fixed multiple semicolons yielding syntax errors, skip them instead
  (@thekid)
• Removed support for using curly braces as offset (e.g. $value{0})
  (@thekid)
• Merged PR #22: Stream tokens directly instead of using if/else cascade
  (@thekid)
• Merged PR #18: Allow match without expression: match { ... }. See
  https://wiki.php.net/rfc/match_expression_v2#allow_dropping_true
  (@thekid)
• Merged PR #17: Refactor parsing to allow blocks anywhere an expression
  is allowed. This not only allows fn() => { ... } but also using blocks
  in match expressions.
  (@thekid)
• Merged PR #21: Remove legacy XP annotations (#[@annotation]) - @thekid
• Merged PR #19: Remove support for Hack language annotations - @thekid
• Merged PR #20: Remove transformations API - @thekid

6.1.0: Non-capturing catches

• Added support for non-capturing catches, see this PHP 8 RFC:
  https://wiki.php.net/rfc/non-capturing_catches
  (@thekid)

6.0.0: Omit start tag

• Merged PR #16: Omit start token from stream - @thekid

5.4.0: Deprecate hacklang style annotations

• Merged PR #9: Deprecate hacklang-style annotations in favor PHP 8
  attributes. This is step 2 of xp-framework/compiler#86
  (@thekid)