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.

show more ...

Support php 8.0 "Constructor Promotion" and attributes (#160)

- attributes are only available in AST version 80+,
and will be null before php 8.0

Support php 8.0's mixed type (#156)

Fixes #154

- We've preferred AST versions that are multiples of 10 for previous releases.