Ensures that the Mac now retains its ROM properly.

Machines/Utility/MemoryPacker.cpp

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+//
+//  MemoryPacker.cpp
+//  Clock Signal
+//
+//  Created by Thomas Harte on 03/05/2019.
+//  Copyright © 2019 Thomas Harte. All rights reserved.
+//
+
+#include "MemoryPacker.hpp"
+
+void Memory::PackBigEndian16(const std::vector<uint8_t> &source, uint16_t *target) {
+	for(std::size_t c = 0; c < source.size(); c += 2) {
+		target[c >> 1] = uint16_t(source[c] << 8) | uint16_t(source[c+1]);
+	}
+}