[cs] use strict comparison where allowed

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

Remove deprecation of Name::$parts

It doesn't look like this is going away for now, and we currently
don't have the APIs to cover all existing usages elegantly.

Generate PHP 7 type annotations

Add getShortName() API

PHP's name resolution rules are f'ing complicated.

Improve doc comments

Mark Name::$parts as deprecated

Represent empty Name::slice() using null

Instead of a Name([]) dummy value, that is invalid in other
contexts.

Explicitly support Name copy construction

It already worked beforehand by accident ... make clear it's
actually supported.

Remove Name::append() and Name::prepend()

Remove $separator arg from Name::toString()

Remove deprecated Name::set*() methods

Extend Name::slice() to support negative length+offset

Switch NameResolver resolve methods to be immutable

To make it theoretically possible to expose this as API.

Add slice() method to Name to allow this. Deprecate existing mutable

Switch NameResolver resolve methods to be immutable

To make it theoretically possible to expose this as API.

Add slice() method to Name to allow this. Deprecate existing mutable
Name APIs.

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Add partial group use support

Supported via Stmt\GroupUse which has Name $prefix in addition to
the usual.

Still missing: Mixed group uses.

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