Adds transcoding of ostensible list selections to Boolean selections, and vice versa.

Configurable/Configurable.cpp

@@ -0,0 +1,27 @@
+//
+//  Configurable.cpp
+//  Clock Signal
+//
+//  Created by Thomas Harte on 18/11/2017.
+//  Copyright © 2017 Thomas Harte. All rights reserved.
+//
+
+#include "Configurable.hpp"
+
+using namespace Configurable;
+
+ListSelection *BooleanSelection::list_selection() {
+	return new ListSelection(value ? "yes" : "no");
+}
+
+ListSelection *ListSelection::list_selection() {
+	return new ListSelection(value);
+}
+
+BooleanSelection *ListSelection::boolean_selection() {
+	return new BooleanSelection(value != "no" && value != "n");
+}
+
+BooleanSelection *BooleanSelection::boolean_selection() {
+	return new BooleanSelection(value);
+}