[CS] Use ::class notation instead of string

Conflicts:
test/PhpParser/ParserFactoryTest.php
test/PhpParser/ParserTest.php

[CS] Open class brackets in new line

[CS] Use elseif instead of else if

Conflicts:
lib/PhpParser/TokenStream.php

Refactoring tests

Store start token position in comments

add strict_types to tests + fix explode type

Add get{Start,End}{Line,TokenPos,FilePos}() methods

Don't return by ref from getAttribute()

This is not worth the few times where it might be useful.

Add Node::getComments() method

[cs] apply same to tests

Add Node::setAttributes() (#385)

Remove Node::setLine() method

Generate PHP 7 type annotations

Always use Identifier nodes

The parser will now always generate Identifier nodes (for
non-namespaced identifiers). This obsoletes the useIdentifierNodes
parser option.

Node

Always use Identifier nodes

The parser will now always generate Identifier nodes (for
non-namespaced identifiers). This obsoletes the useIdentifierNodes
parser option.

Node constructors still accepts strings and will implicitly create
an Identifier wrapper. Identifier implement __toString(), so that
outside of strict-mode many things continue to work without changes.

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Bump phpunit version (#381)

Renamve Param::$name to Param::$var

As it now contains a Variable node.

Enforce useConsistentVariableNames

Add NodeAbstract::setDocComment()

Add missing canonicalization in test

Implement JsonSerializable for Nodes and Comments

Exposes the properties and adds an additional nodeType property.

Drop support for old Node format

Use real properties for storing subnodes

Instead of storing subnodes in a subNodes dictionary, they are
now stored as simple properties. This requires declarating the
properties, ass

Use real properties for storing subnodes

Instead of storing subnodes in a subNodes dictionary, they are
now stored as simple properties. This requires declarating the
properties, assigning them in the constructor, overriding
the getSubNodeNames() method and passing NULL to the first argument
of the NodeAbstract constructor.

[Deprecated: It's still possible to use the old mode of operation
for custom nodes by passing an array of subnodes to the constructor.]

The only behavior difference this should cause is that getSubNodeNames()
will always return the original subnode names and skip any additional
properties that were dynamically added. E.g. this means that the
"namespacedName" node added by the NameResolver visitor is not treated
as a subnode, but as a dynamic property instead.

This change improves performance and memory usage.

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Use stricter assertions where possible

Port library to use namespaces, with BC for old names