Adds an empty vessel for .z80 support.

Storage/State/Z80.cpp

@@ -0,0 +1,15 @@
+//
+//  Z80.cpp
+//  Clock Signal
+//
+//  Created by Thomas Harte on 25/04/2021.
+//  Copyright © 2021 Thomas Harte. All rights reserved.
+//
+
+#include "Z80.hpp"
+
+using namespace Storage::State;
+
+std::unique_ptr<Analyser::Static::Target> Z80::load(const std::string &file_name) {
+	return nullptr;
+}