Ensures that the Mac now retains its ROM properly.

Machines/Utility/MemoryPacker.hpp

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+//
+//  MemoryPacker.hpp
+//  Clock Signal
+//
+//  Created by Thomas Harte on 03/05/2019.
+//  Copyright © 2019 Thomas Harte. All rights reserved.
+//
+
+#ifndef MemoryPacker_hpp
+#define MemoryPacker_hpp
+
+#include <cstdint>
+#include <vector>
+
+namespace Memory {
+
+/*!
+	Copies the bytes from @c source into @c target, interpreting them
+	as big-endian 16-bit data.
+*/
+void PackBigEndian16(const std::vector<uint8_t> &source, uint16_t *target);
+
+}
+#endif /* MemoryPacker_hpp */