Move verifyModifier/verifyClassModifier to Modifiers class

Now that the Modifiers are in a separate class, these *internal*
verification methods should also be moved there.

Add missing parameter types

Add phpstan baseline

Rename Stmt\UseUse to UseItem

Rename Scalar\Encapsed to Scalar\InterpolatedString

Rename Scalar\EncapsedStringPart to InterpolatedStringPart

It is no longer an expression node, which unfortunately does
require a more awkward type for the Encaps node.

Rename Scalar\LNumber to Scalar\Int_

Rename Expr\ArrayItem to ArrayItem

Array items are not expressions by themselves.

Make sure Array nodes can not contain null

Now that destructuring is always represented using List nodes,
make sure that Array nodes can no longer contain null elements,
so well-type

Make sure Array nodes can not contain null

Now that destructuring is always represented using List nodes,
make sure that Array nodes can no longer contain null elements,
so well-typed code doesn't have to deal with them unnecessarily.

If an array does contain empty elements, these are now result in
an error and are represented as a ArrayItem with Error value if
error recovery is used.

The implementation is a bit tricky because at the time the Array
node is created, we cannot tell whether it will be used in a
creation or destructuring context. For this reason the error
reporting is delayed parsing has finished.

Closes #876.

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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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Introduce separate Modifiers class

Use PhpParser\Modifiers::PUBLIC instead of
PhpParser\Node\Stmt\Class_::MODIFIER_PUBLIC, etc. Old constants
of course remain available.

Fix

Introduce separate Modifiers class

Use PhpParser\Modifiers::PUBLIC instead of
PhpParser\Node\Stmt\Class_::MODIFIER_PUBLIC, etc. Old constants
of course remain available.

Fixes #476.

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Always use List_ node for array destructuring

Fixes #471.

ParserAbstract: remove undefined class in `use`

Class `PhpParser\Parser\Tokens` not exists in current version

Add PhpVersion class

Add visibility modifiers to constants

Closes GH-848.

No superfluous elseif

Replaces superfluous elseif with if.

Nullable type declaration for default null value

Adds ? before type declarations for parameters with a default null value

No unused imports

Unused use statements must be removed.

Add Parser::getLexer() method

Not sure if this is going to stick, but for now this makes it
easier to obtain the Lexer instance when creating the parser via
ParserFactory.

Move Tokens::T_* to Php7::T_*

Drop the separate tokens class, move them into the parser.

Move token mapping from lexer to parser

This allows a different token mapping per parser.

Add support for true type

The null/false types were alread accepted previously, even though
they are only legal as standalone types since PHP 8.2.

Remove PHP 5 parser

Add some missing type annotations

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

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

PHP implementation: php/php-src#7305