Added resumable loading, along with signal handling.

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

U2F_Init_CMD.hpp

@@ -1,11 +1,14 @@
 #pragma once
 #include <cstdint>
+#include <memory>
 #include "U2F_CMD.hpp"
+#include "U2FMessage.hpp"
 
 struct U2F_Init_CMD : U2F_CMD
 {
 	uint64_t nonce;
 
 	public:
-		static U2F_Init_CMD get();
+		U2F_Init_CMD(const std::shared_ptr<U2FMessage> uMsg);
+		virtual void respond(const uint32_t channelID) const override;
 };