Add more property types

Some of these are not maximally accurate due to lack of union
types.

Use array<string, mixed> type for $attributes

Slightly more accurate, and stops PHPStan from complaining about
the missing array type information.

Add php-cs-fixer config and reformat

The formatting in this project has become something of a mess,
because it changed over time. Add a CS fixer config and reformat
to the desired st

Add php-cs-fixer config and reformat

The formatting in this project has become something of a mess,
because it changed over time. Add a CS fixer config and reformat
to the desired style, which is PSR-12, but with sane brace placement.

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Add CallLike parent class

This provides a helper to determine whether a call is a first-class
callable, and a way to strip the args type to Arg[] if it isn't.

Avoid parent constructor call during node construction

Instead explicitly assign the attributes. This is a minor
performance improvement.

Add public visibility to getType method (#463)

Add explicit getType() methods

Rather than automatically deriving getType() from the class name.

Add strict_types to lib code

[cs] use PHP 5.4 short array, since PHP 7.0 is min version

Generate PHP 7 type annotations

Drop support for old Node format

Add support for anonymous classes

Has not landed upstream yet, but syntax is unlikely to change.

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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Make autoloader for new names PSR-0 compliant