- fix the size of input data error (forget mul with the size of unit)
- fix the wrong code name for UTF16 and UTF32.
- fix wrong assign for `outbytesleft`.
- translate zh-CN comment into en-US.
- change some comment into Doxygen style.
- add lost Doxygen comment.
- enrich the testbench for ceil_div.
- add lost metaprogramming functions for some files in macro namespace.
- 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.
- rename encoding::utf to encoding::stlcvt.
- use uv to manage script and add pycodec generator script.
- update script in modern python.
- fix added pycodec generator.
- add endian and compiler detector, and modify os detector.
- now we use CMake to add detector-used macro, instead of using some C++ features to detect them.
- change Windows environment detection according to the change of os detector.
