refactor: refactor old IOHelper.

- move pointer left padding macro into single header file.
- move utf8 fopen into single header but not finished.
- add testbench for pointer left padding macro.
- add system pointer size detector according to new migrated features requested.

src/yycc/macro/ptr_size_detector.hpp

@@ -0,0 +1,6 @@
+#pragma once
+
+// Check pointer size macro
+#if (defined(YYCC_PTRSIZE_32) + defined(YYCC_PTRSIZE_64)) != 1
+#error "Current environment used pointer size is not supported!"
+#endif