Fix typo in upgrading guide

Fixes #973.

Upgrading guide tweaks

Add upgrading nodes for changes since beta1

Fixes #965.
Fixes #966.

Fix typos in UPGRADE-5.0.md

Don't parse unicode escapes for PHP < 7.0

We still had the option for this but were hardcoding it to true.
Make it conditional on the PHP version instead.

Add upgrading notes for lexer changes

Deprecate Node::getLine() in favor of Node::getStartLine()

Remove deprecated Comment methods

Indent heredoc/nowdoc when targeting PHP >= 7.3

Default pretty printer to PHP 7.4

Raise minimum PHP version to PHP 7.4

Update CHANGELOG and UPGRADING

Use PHP 7.1 as default pretty printer target

Update upgrading documentation

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\LNumber to Scalar\Int_

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.

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.