Add newline at end of file for many tests

Add the newline in reconstructTest() and run updateTests.php, to
reduce spurious diffs in the future.

Rename Expr\ClosureUse -> ClosureUse

This is not a real expression, treat it similarly to Node\Arg
or Node\Param.

The old name is retained as an alias for compatibility.

Remove PHP 5 parser

[PHP 8.0] Add attributes support (#661)

Adds support for PHP 8 attributes, represented using `AttrGroup` nodes
containing `Attribute` nodes. The `attrGroup` subnode is added to all
n

[PHP 8.0] Add attributes support (#661)

Adds support for PHP 8 attributes, represented using `AttrGroup` nodes
containing `Attribute` nodes. The `attrGroup` subnode is added to all
nodes that can have attributes.

This is still missing FPPP support.

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

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[PHP 8.0] Support trailing comma in closure use list

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