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

Add phpstan baseline

Fix some phpstan warnings

Fixed type in UnionType

(cherry picked from commit 2f1fd784fe5560675722a1e5cbbcece5f43bf3a0)

Remove phpunit 6.5

With the minimum version raised to PHP 7.1, there should be no
more need for PHPUnit 6.

Use Node\ClosureUse instead of Expr\ClosureUse in parser

Fixes #883.

Fix pretty printing example

Release PHP-Parser 5.0.0-alpha1

More docs updates

Add --version flag to php-parse

Partial documentation update

Fix empty list insertion of multiple attributes

Update changelog

Fix formatting preservation for match

Switch list insertion maps to use class name

Also highlights that the list insertion entry for Expr\Match
was not used.

Switch modifierChangeMap to use class name

For better refactoring support, prefer class name over node type.

Fix ArrayItem entries in pretty printer maps

The tests were written in such a way that the regression was not
caught.

Rename Stmt\UseUse to UseItem

Rename Stmt\PropertyProperty to PropertyItem

Rename Stmt\DeclareDeclare to DeclareItem

Support array return from enterNode()

This uses the same semantics as arrays from leaveNode(), i.e. the
returned nodes will not be visited by other visitors. This is open
to change t

Support array return from enterNode()

This uses the same semantics as arrays from leaveNode(), i.e. the
returned nodes will not be visited by other visitors. This is open
to change though (but probably should change for both enterNode()
and leaveNode() if it does change?)

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