Add support for collecting classes declared with typedef or using in C++

[aalramadan]

Right now, Stereocode collects class declarations in standard forms (e.g., class MyClass { ... };). However, in C++ it is also possible to declare classes via typedef or using aliases:

typedef class : public Base {
public:
    int value;
    int getValue() { return value; }
} TypedefClass;

using UsingClass = class : public Base {
public:
    int value;
    int getValue() { return value; }
};

These are class declarations, and not objects (like in the anonymous class case). Stereocode currently does not collect them, which it should.