Refactor some parts of the Architecture:

* JSON visitor are located in the format namespace
  * Visitor are *real* visitor
  * Visitable class has been renamed to Object
  * Due to a bug in Visual Studio 2015, we move to VS2017

api/python/Abstract/objects/pySection.cpp

@@ -23,7 +23,7 @@ template<class T>
 using setter_t = void (LIEF::Section::*)(T);
 
 void init_LIEF_Section_class(py::module& m) {
-  py::class_<LIEF::Section>(m, "Section")
+  py::class_<LIEF::Section, LIEF::Object>(m, "Section")
     .def(py::init(),
         "Default constructor")