Pupilio

- Improve UI.

- Fix native library bugs.

- Fixed a potential crash bug in pygame calibration.
- Fixed an issue with the `CalibrationListener` callback.
- Improved the calibration UI.

- Added `enable_kappa_verify`, `enable_debug`, and `log_dir` to `DefaultConfig`.
- Updated `previewer_demo` and renamed the old version to `previewer_demo_legacy.py`.
- Reduced native library calibration time.
- Added preview images to calibration UI.
- Improve UX design of demonstrations.
- Added five calibration mode in `graphics.py` and `graphics_pygame.py`.
- Added `_et_native_lib.pupil_io_set_cali_mode` function signature.
- Updated `docs`.
- Added previewer function on calibration.
- Added multiple international language.
- Added calibration callbacks
- Update default config

---

- Fixed video playback stuttering caused by the OpenCV library.
- Fixed minor issues with `PupilioET`.
- Added configuration for Pupilio (major update).
- Removed `msvcp120.dll`, `msvcr120.dll`.
- Added three demos: preview demo, custom configuration demo, and previewer demo.
- Fix a bug when user calls `save_data` function passing a file name without directory.
- Improve calibration UI

---

- Added support for filter parameter: look_ahead.
- Fixed issues with saving to paths containing Chinese characters.
- Resolved UI problems in PsychoPy calibration.
- Native library compiled statically with MSVC.
- The valid field is set to -1 when no face is detected.
- Simplified the DLL environment.
- Added support for the PsychoPy GUI interface.
- Added a timestamp to the session name to serve as a unique session ID.
- Prepare to add a config for controlling the behavior of the eye tracker.
- More precision trigger sender.
- Add LICENSE file.

---