Cleanup imports

Thanks PhpStorm :)

Graceful handling for "special" errors

Nearly all special errors are now handled gracefully, i.e. the
parser will be able to continue after encountering them. In some
cases the assoc

Graceful handling for "special" errors

Nearly all special errors are now handled gracefully, i.e. the
parser will be able to continue after encountering them. In some
cases the associated error range has been improved using the new
end attribute stack.

To achieve this the error handling code has been moved out of the
node constructors and into special methods in the parser.

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Rename $type subnode to $flags

Type makes it sound like a type-hint, and on a number of other nodes
$type is used for exactly that. Use $flags to hold modifiers instead.

Fix implicit visibility for properties as well

Also switch to using PPP mask.

Fix implicit visibility for properties as well

Also switch to using PPP mask.

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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Implicit public should not generate as explicit public

Error on final or abstract properties

Use "public" visibility when not explicitly given

Fixes issue #143

Port library to use namespaces, with BC for old names