[8.4] Add support for asymmetric visibility modifiers

Represented using new PRIVATE_SET, PROTECTED_SET and PUBLIC_SET
bits in Modifiers.

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

[8.4] Add support for asymmetric visibility modifiers

Represented using new PRIVATE_SET, PROTECTED_SET and PUBLIC_SET
bits in Modifiers.

RFC: https://wiki.php.net/rfc/asymmetric-visibility-v2

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Add Modifiers::toString() helper

Convert an integer modifier into a string.

Add missing return types

Move verifyModifier/verifyClassModifier to Modifiers class

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

Require strict_types in php-cs-fixer config

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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