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.hpp

@@ -8,9 +8,8 @@
  * They are crucial before using YYCC.
  */
 
-// Library Version and Comparison Macros
+// Library version
 #include "yycc/version.hpp"
-#include "yycc/macro/version_cmp.hpp"
 
 // Detect essential macros
 // Operating System macros
@@ -19,8 +18,9 @@
 #include "yycc/macro/compiler_detector.hpp"
 // Endian macros
 #include "yycc/macro/endian_detector.hpp"
-
-// Batch Class Move / Copy Function Macros
-#include "yycc/macro/class_copy_move.hpp"
+// Pointer size macros
+#include "yycc/macro/ptr_size_detector.hpp"
+// STL macros
+#include "yycc/macro/stl_detector.hpp"
 
 namespace yycc {}