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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Add AST_PROP_GROUP in version 70.

The type information is deliberately left out of versions < 70.

`children['type']` is a Node describing the type of the property group,
or null

Add AST_PROP_GROUP in version 70.

The type information is deliberately left out of versions < 70.

`children['type']` is a Node describing the type of the property group,
or null.
`children['props']` is the AST_PROP_DECL.

The property visibility modifier flags were moved to the AST_PROP_GROUP.

Update package.xml

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