py3: App: files D-Z ported to python3

issue 0000995
diff to py3-branch will remain in the following files in src/App:
- ExtensionContainer.cpp
- FeaturePythonPyImp.h +.inl
most likely these files depend on Tools and Base

src/App/ObjectIdentifier.cpp

@@ -1035,18 +1035,28 @@ boost::any ObjectIdentifier::getValue() const
 
     if (!pyvalue)
         throw Base::RuntimeError("Failed to get property value.");
-
+#if PY_MAJOR_VERSION < 3
     if (PyInt_Check(pyvalue))
         return boost::any(PyInt_AsLong(pyvalue));
+#else
+    if (PyLong_Check(pyvalue))
+        return boost::any(PyLong_AsLong(pyvalue));
+#endif
     else if (PyFloat_Check(pyvalue))
         return boost::any(PyFloat_AsDouble(pyvalue));
+#if PY_MAJOR_VERSION < 3
     else if (PyString_Check(pyvalue))
         return boost::any(PyString_AsString(pyvalue));
+#endif
     else if (PyUnicode_Check(pyvalue)) {
         PyObject * s = PyUnicode_AsUTF8String(pyvalue);
         destructor d2(s);
 
+#if PY_MAJOR_VERSION >= 3
+        return boost::any(PyUnicode_AsUTF8(s));
+#else
         return boost::any(PyString_AsString(s));
+#endif
     }
     else if (PyObject_TypeCheck(pyvalue, &Base::QuantityPy::Type)) {
         Base::QuantityPy * qp = static_cast<Base::QuantityPy*>(pyvalue);