#13 Move Code generator from WSDL::Definitions to separate class

[Martin Kutter]

The code generator should be factored out from WSDL::Definitions (and the other WSDL::* data classes) to it's own hierarchy.

Templates should be factored out into their own files and split up like methods.

Recursive templates can be used for approching the not-yet-resolved embedded complexTypes feature request.

[Martin Kutter]

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- fixed in #283.
- there's still cleanup needed.