[PHP 8.2] Add readonly class support (#834)

RFC: https://wiki.php.net/rfc/readonly_classes

PHP implementation: php/php-src#7305

[String_] Add rawValue attribute (#831)

[DNumber] Add rawValue attribute to hold the original value (#833)

[LNumber] Add rawValue attribute to LNumber to allow numeric separator etc. (#832)

Reflect support for PHP 8.1 in the README

Fix PHPDoc type of namespacedName properties

Release PHP-Parser 4.13.2

Declare namespacedName property

For historical reasons, this property is used by the NameResolver
(in default mode). Declare it explicitly, rather than using a doc
comment.

Fix typo in property name

This test was working on a dynamic "subNode" property, rather
than an actual subnode (either subNode1 or subNode2).

This test is generally not very val

Fix typo in property name

This test was working on a dynamic "subNode" property, rather
than an actual subnode (either subNode1 or subNode2).

This test is generally not very valuable, I think it dates back
to a time where __get()/__set() were used.

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Avoid creation of dynamic property in test

This test requires a property that is not a subnode -- but it does
not need to be dynamic, a declared property works just as well.

Add CallLike test for NullsafeMethodCall

Make NullsafeMethodCall extend from CallLike

Fix minor typo

Added builders for enum and enum case

Release PHP-Parser 4.13.1

Code highlighting

Rename identifier/identifier_ex productions

The names were easy to get wrong, because the corresponding names
in zend_language_parser.y are T_STRING/identifier, so just copying
ident

Rename identifier/identifier_ex productions

The names were easy to get wrong, because the corresponding names
in zend_language_parser.y are T_STRING/identifier, so just copying
identifier from upstream gives the wrong behavior.

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Support reserved keywords as enum cases

Fixes #807.

Fixed array value evaluation with unpacked array

Fixed ArrowFunction::$expr

Update .gitattributes

Release PHP-Parser 4.13.0

Unified builder methods for setting types

Add CallLike parent class

This provides a helper to determine whether a call is a first-class
callable, and a way to strip the args type to Arg[] if it isn't.

Don't make VariadicPlaceholder an expression

And don't store it in an Arg.