* Add overloads on signals.
The overload adds the NetworkError and the error string to the signal. Both signal will be emitted. Clients are supposed to subscribe to only one of the overloads.
* refactor generated code alignement
* Do not use method overload for signals. Instead, have another naming convention for signal that carries Error information.
Why ? Because signal overloading and QT5 connector with method referencing do not mix well (see http://stackoverflow.com/questions/16794695/connecting-overloaded-signals-and-slots-in-qt-5). It would need to specify exactly which overload to take. That is cumbersome to write AND is a breaking change for the consumer of the generated code.
* update qt5 sample files
