Add missing phpdoc annotations in AST nodes (#946)

Remove superfluous phpdoc tags

These just specify a type that is already specified as a real PHP
type.

Add property types

Types omitted in two places where we violate them currently:
Namespace_::$stmts can be null during parsing, and Enum_::$scalarType
can be a complex type for invali

Add property types

Types omitted in two places where we violate them currently:
Namespace_::$stmts can be null during parsing, and Enum_::$scalarType
can be a complex type for invalid programs.

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Add php-cs-fixer config and reformat

The formatting in this project has become something of a mess,
because it changed over time. Add a CS fixer config and reformat
to the desired st

Add php-cs-fixer config and reformat

The formatting in this project has become something of a mess,
because it changed over time. Add a CS fixer config and reformat
to the desired style, which is PSR-12, but with sane brace placement.

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[PHP 8.0] Add match expressions (#672)

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

Closes #671.