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.

Remove MODIFIER_ prefix from node dumps

These constants are now called Modifiers::PUBLIC rather than
Class_::MODIFIER_PUBLIC etc, so update the dumped name as well.

Rename Expr\ArrayItem to ArrayItem

Array items are not expressions by themselves.

Remove PHP 5 parser

Add support for new PHP 8.1 modifiers (#796)

Implement support for readonly properties (https://wiki.php.net/rfc/readonly_properties_v2) and
final class contstants (https://wiki.php.net/

Add support for new PHP 8.1 modifiers (#796)

Implement support for readonly properties (https://wiki.php.net/rfc/readonly_properties_v2) and
final class contstants (https://wiki.php.net/rfc/final_class_const).

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