Add support for perserving formatting for static modifier change

Closes GH-891.

Show missing format preservation when adding static modifier to closure

Test PHP 8.2 in CI

Support readonly before DNF type

This makes us match the PHP 8.2 handling of readonly. Handling of
"readonly" functions is moved to the parser to allow distinguishing
them from reado

Support readonly before DNF type

This makes us match the PHP 8.2 handling of readonly. Handling of
"readonly" functions is moved to the parser to allow distinguishing
them from readonly properties with DNF types. We have to uglify the
grammar to avoid some shift/reduce conflicts. Thank you WordPress.

show more ...

Slightly more precise type

Bail out on list insertion of non-Node

PhpStan correctly detected that this is not supported. We could
add support for it, but for now just make sure it doesn't crash.

Fix some types

Use PhpStan level 6

New baseline errors are array types that I prefer to leave alone,
as well as one PhpStan bug:
https://github.com/phpstan/phpstan/issues/4526

Specify more types

Specify more types

Remove deprecated Error constructor

And use this chance to provide accurate position information for
namespace errors.

Specify some more types

Use array<string, mixed> type for $attributes

Slightly more accurate, and stops PHPStan from complaining about
the missing array type information.

Support adding class constants in trait builder

These are allowed as of PHP 8.2.

Add some missing property types

Add missing return types

Add return types to PrettyPrinter\Standard

Fix formatting preservation for alternative elseif/else syntax

Test taken from PR #797.

Add isPublic() etc methods on Param node

Also isPromoted() to check for any flags.

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 isReadonly on Param node

Add missing parameter types

Add tools/ directory

With php-cs-fixer and phpstan. Also reformat one file.

Drop phpstan from composer.json

It does not support PHP 7.1, so we should not include it
unconditionally.

Use PHPStan level 5