Add support for dumping positions in NodeDumper

NodeDumper: Resolve type for include/use as well

NodeDumper: Print modifiers as strings

Add dumpComments option to NodeDumper

Adding this as an option to avoid breaking people's tests.

Some of the test results show pretty clearly that we are incorrectly
assigning t

Add dumpComments option to NodeDumper

Adding this as an option to avoid breaking people's tests.

Some of the test results show pretty clearly that we are incorrectly
assigning the same comment multiple times for nested nodes (mentioned
in #36).

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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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prevent a unnecessary concat

analog to https://github.com/nikic/PHP-Parser/commit/b7ffdbbb929f9f07780a236659d1d1baf68ef137

Optimize node dumper

For very deeply nested node trees this extra concatenation makes a
huge difference...

Port library to use namespaces, with BC for old names