More C++17 tidying up. Should be no user visible changes.

Signed-off-by: Adrian Conlon <adrian.conlon@gmail.com>

inc/Device.h

@@ -69,6 +69,9 @@
 		[[nodiscard]] PinLevel& name () noexcept { \
 			return m_## name ## _Line; \
 		} \
+		[[nodiscard]] const PinLevel& name () const noexcept { \
+			return m_## name ## _Line; \
+		} \
 	visibility : \
 		DECLARE_PIN_LEVEL_CHANGERS(name) \
 	private: \

inc/EightBitCompilerDefinitions.h

@@ -1,7 +1,6 @@
 #pragma once
 
 #include <cassert>
-#include <bitset>
 
 #ifdef _MSC_VER
 #	include <intrin.h>
@@ -9,6 +8,8 @@
 
 #ifdef __GNUG__
 #	include <x86intrin.h>
+#else
+#	include <bitset>
 #endif
 
 namespace EightBit {

inc/InputOutput.h

@@ -1,7 +1,6 @@
 #pragma once
 
 #include <cstdint>
-#include <array>
 
 #include "Memory.h"
 #include "Ram.h"

inc/IntelHexFile.h

@@ -1,14 +1,14 @@
 #pragma once
 
 #include <cstdint>
-//#include <fstream>
+#include <fstream>
 #include <string>
-//#include <ios>
-//#include <sstream>
+#include <ios>
+#include <sstream>
 #include <map>
 #include <optional>
 #include <vector>
-//#include <utility>
+#include <utility>
 
 namespace EightBit {
 	class IntelHexFile final {