Common: Create HRWrap

HRWrap now allows HRESULT to be formatted, giving useful information beyond "it failed" or a hex code that isn't obvious to most users.  This commit does not add any uses of it, though.

Source/Core/Common/HRWrap.cpp

@@ -0,0 +1,17 @@
+// Copyright 2021 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "HRWrap.h"
+
+#include <comdef.h>
+#include "Common/StringUtil.h"
+
+namespace Common
+{
+std::string GetHResultMessage(HRESULT hr)
+{
+  // See https://stackoverflow.com/a/7008111
+  _com_error err(hr);
+  return TStrToUTF8(err.ErrorMessage());
+}
+}  // namespace Common