Fix formatting preservation for alternative elseif/else syntax

Test taken from PR #797.

Fix some phpstan warnings

Use Node\ClosureUse instead of Expr\ClosureUse in parser

Fixes #883.

Rename Stmt\UseUse to UseItem

Rename Stmt\PropertyProperty to PropertyItem

Rename Stmt\DeclareDeclare to DeclareItem

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\DNumber to Scalar\Float_

Rename Stmt\StaticVar to StaticVar

This is part of a statement, not a statement by itself.

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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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.

Add support for DNF types (#862)

Add PhpVersion class

Add visibility modifiers to constants

Closes GH-848.

Add PHP 8 parser with correct concatenation precedence

The PHP 7 and PHP 8 parsers use the same grammar file and only
differ in token precedence.