Drastic settings refactoring

src/ifcwrap/utils/type_conversion.i

@@ -185,4 +185,20 @@
 		}
 		return pyobj;
 	}
+
+	struct pythonizing_visitor {
+		typedef PyObject* result_type;
+
+		template <typename T>
+		PyObject* operator()(const T& t) {
+			return pythonize(t);
+		}
+
+		template <>
+		PyObject* operator()(const std::set<int>& t) {
+			std::vector<int> vs(t.begin(), t.end());
+			return pythonize_vector(vs);
+		}
+	};
+
 %}

src/ifcwrap/utils/typemaps_out.i

@@ -147,3 +147,8 @@ CREATE_VECTOR_TYPEMAP_OUT(IfcParse::inverse_attribute const *)
 CREATE_VECTOR_TYPEMAP_OUT(IfcParse::entity const *)
 CREATE_VECTOR_TYPEMAP_OUT(IfcParse::declaration const *)
 CREATE_VECTOR_TYPEMAP_OUT(IfcGeom::ConversionResultShape *)
+
+%typemap(out) boost::variant<bool, int, double, std::string, std::set<int>> {
+	pythonizing_visitor vis;
+	$result = $1.apply_visitor(vis);
+}