namespaces c++ header files generation (#1703)

good day,

thank you for fixing the first issue. now the keyword namespace can be seen. but still there are 2 main problems:

1- when geenrating code as default c++ file the namespaces are csharp(A.B.C) style and not c++ style (A::B::C).

2- when generating multiple header in cpp,the namespaces are completly missing.

example:

/****** header *******/

// x.h

#include <iostream>

namespace A{

class classInA{

public:

void methodClassInA();

};

}

/******* source file ****/

// x.cpp

#include "x.h"

void A::classInA::methodClassInA(){

std::cout<<"method inside class inside namespace A"<<std::endl;

}