Add encaps var flags for AST_DIM/AST_VAR for php 8.2 (#227)

For https://wiki.php.net/rfc/deprecate_dollar_brace_string_interpolation

Closes #224

In util.php: Don't print a

Add encaps var flags for AST_DIM/AST_VAR for php 8.2 (#227)

For https://wiki.php.net/rfc/deprecate_dollar_brace_string_interpolation

Closes #224

In util.php: Don't print a 0 flag value for combinable flags

For php-ast self-testing, minimize the number of changes in the future
when similar combinable flags get added to existing ast var types.

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Support php 8.1 read-only properties, first-class callable syntax (#209)

Add php 8.1 readonly property support, first-class callables

And run all tests even after the first case fai

Support php 8.1 read-only properties, first-class callable syntax (#209)

Add php 8.1 readonly property support, first-class callables

And run all tests even after the first case fails

Mark ast version 90 as current and 85 as no longer experimental.

Add date to changelog, bump version in php_ast.h

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