Update php-yacc, remove unused tokens

Remove last uses of MockBuilder

Avoid most MockBuilder uses in NodeVisitor testing

This removes all the warnings about at() usage ... even though
it is still used. Apparently warnings don't get emitted if the
at()

Avoid most MockBuilder uses in NodeVisitor testing

This removes all the warnings about at() usage ... even though
it is still used. Apparently warnings don't get emitted if the
at() usage is inside a data provider?

show more ...

Avoid one use of MockBuilder

We can just use anon classes here and avoid PHPUnits unreliable
MockBuilder.

Update Array_ annotations, items are nullable (#696)

When used to destructure, items are optional. E.g. `[$a, , $b] = [1, 2, 3];`.

Remove an unnecessary use of at()

Allow PHPUnit 9

Fix a token reference

Add reverse emulation support

Add common KeywordEmulator

The logic for keyword emulation is always going to be the same.

Accept a phpVersion option in emulative lexer

Testing this will require reverse emulation support.

Separate out emulator version info

Release PHP-Parser 4.7.0

Implement emulation of PHP 8 T_NAME_* tokens

Like comment emulation, this is unconditional, as it is required
for core functionality.

Migrate grammar to use PHP 8 T_NAME_* tokens

This will break everything on PHP < 8.

[PHP 8.0] Support trailing comma in closure use list

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

Fix handling of unterminated comment with trailing newline

Fixes #688.

Fix file name

Added missing entry to change log and correct next version indicator (#685)

* Added missing entry to change log and correct next version indicator

* Update composer.json

Fixed rebuildParsers.php (#686)

phpyacc is a sh file and should not be run via the php interpreter, but directly.

[PHP 8.0] Add match expressions (#672)

RFC: https://wiki.php.net/rfc/match_expression_v2
Upstream implementation: php/php-src#5371

Closes #671.

Corrected license text

Fixed branch alias

Add ParentConnectingVisitor and NodeConnectingVisitor (#681)

Release PHP-Parser 4.6.0