Add originalName attribute in NameResolver

For now gated behind a preserveOriginalNames option.

Fix pretty-printing of nullable types

NameResolver - resolve Name in NullableType

Cleanup imports

Thanks PhpStorm :)

Add namespacedName attribute on runtime-resolved names

The NameResolver now adds a namespacedName attribute on function/
const names which cannot be statically resolved.

Disable cloning in traverser by default

Support running against PHP 7 testsuite

Support mixed group use declarations

Add partial group use support

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

Still missing: Mixed group uses.

Add support for anonymous classes

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

Replace another Scalar\String occurance

Also canonicalize NameResover tests to avoid those pesky CRLF
issues.

Rename nodes for compat with PHP 7

The old names will still be available on PHP 5.x.

Add support for return type declarations [PHP 7]

This adds an additional "returnType" subnode to Stmt\Function_,
Stmt\ClassMethod and Expr\Closure, as well as the corresponding
suppo

Add support for return type declarations [PHP 7]

This adds an additional "returnType" subnode to Stmt\Function_,
Stmt\ClassMethod and Expr\Closure, as well as the corresponding
support in the name resolver and pretty printer.

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Fix whitespace when printing trait alias modifiers

Make NameResolver resolve trait alias and precedence names

Use stricter assertions where possible

Fix coverage annotations

Ensure that special class names are unqualified

Replicates the PHP error message

Preserve case of "static" class name

Fix case sensitivity for special class names

Support use function/const in name resolver

Port library to use namespaces, with BC for old names