Added resumable loading, along with signal handling.

This version can store state after receiving SIGINT.
This is achieved by polling FIFO read state;

Channel.hpp

@@ -0,0 +1,32 @@
+#pragma once
+#include <cstdint>
+#include <memory>
+#include "U2FMessage.hpp"
+
+enum class ChannelInitState
+{
+	Unitialised,
+	Initialised
+};
+
+enum class ChannelLockedState
+{
+	Locked,
+	Unlocked
+};
+
+class Channel
+{
+	protected:
+		uint32_t cid;
+		ChannelInitState   initState;
+		ChannelLockedState lockedState;
+
+	public:
+		Channel(const uint32_t channelID);
+		void handle(const std::shared_ptr<U2FMessage> uMsg);
+		
+		uint32_t getCID() const;
+		void init(const ChannelInitState newInitState);
+		void lock(const ChannelLockedState newLockedState);
+};