Fixed compiler warnings for msvc x64

GhettoCrypt/Halfblock.h

@@ -1,9 +1,10 @@
 #pragma once
 #include <bitset>
+#include <cstdint>
 #include "Config.h"
 
 namespace GhettoCipher
 {
-	constexpr int HALFBLOCK_SIZE = (BLOCK_SIZE / 2);
+	constexpr std::size_t HALFBLOCK_SIZE = (BLOCK_SIZE / 2);
 	typedef std::bitset<HALFBLOCK_SIZE> Halfblock;
 }