- 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.
