hle: Add proper type for result code

This should clean up all HLE errorcode in the codebase.

I didn't removed Rust::Result as this should be a cleanup for another
iteration.

include/result/result.hpp

@@ -0,0 +1,8 @@
+#pragma once
+
+#include "result_common.hpp"
+#include "result_kernel.hpp"
+#include "result_os.hpp"
+#include "result_fnd.hpp"
+#include "result_fs.hpp"
+#include "result_gsp.hpp"