Single blank line at eof

A PHP file without end tag must always end with a single empty line feed.

Rename Expr\ClosureUse -> ClosureUse

This is not a real expression, treat it similarly to Node\Arg
or Node\Param.

The old name is retained as an alias for compatibility.

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

Adjust code for constitent var mode

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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Port library to use namespaces, with BC for old names