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_fs.hpp

@@ -0,0 +1,18 @@
+#pragma once
+#include "result_common.hpp"
+
+DEFINE_HORIZON_RESULT_MODULE(Result::FS, FS);
+
+namespace Result::FS {
+    // TODO: Verify this
+    DEFINE_HORIZON_RESULT(FileNotFound, 100, NotFound, Status);
+    // TODO: Verify this
+    DEFINE_HORIZON_RESULT(FileNotFoundAlt, 112, NotFound, Status);
+    // Also a not found error code used here and there in the FS module.
+    DEFINE_HORIZON_RESULT(NotFoundInvalid, 120, InvalidState, Status);
+    DEFINE_HORIZON_RESULT(AlreadyExists, 190, NothingHappened, Info);
+    DEFINE_HORIZON_RESULT(FileTooLarge, 210, OutOfResource, Info);
+    // Trying to access an archive that needs formatting and has not been formatted
+    DEFINE_HORIZON_RESULT(NotFormatted, 340, InvalidState, Status);
+    DEFINE_HORIZON_RESULT(UnexpectedFileOrDir, 770, NotSupported, Usage);
+};