Adds SZX support.

Tweaking exposed Spectrum state object as relevant.

Storage/State/SZX.hpp

@@ -0,0 +1,24 @@
+//
+//  SZX.hpp
+//  Clock Signal
+//
+//  Created by Thomas Harte on 26/04/2021.
+//  Copyright © 2021 Thomas Harte. All rights reserved.
+//
+
+#ifndef Storage_State_SZX_hpp
+#define Storage_State_SZX_hpp
+
+#include "../../Analyser/Static/StaticAnalyser.hpp"
+
+namespace Storage {
+namespace State {
+
+struct SZX {
+	static std::unique_ptr<Analyser::Static::Target> load(const std::string &file_name);
+};
+
+}
+}
+
+#endif /* Storage_State_SZX_hpp */