3.0.0rc4

Full Changelog / 完整更新日志: CHANGELOG.md#-300rc4
Full Commits / 完整提交记录: 3.0.0rc3...3.0.0rc4

✨ Highlights / 更新亮点

• Refactoring the entire event handling mechanism to now bind and handle events almost exactly like native tkinter
  重构整个事件处理机制，现在几乎可以完全像原生 tkinter 那样绑定和处理事件了

• Fixed a bug where the widget InputBox could produce an error when deleting text
  修复了控件 InputBox 在删除文本时可能产生错误的 bug

💥 Breaking Changes / 破坏性更改

• Refactored submodule core.constants and renamed to core.configs
  重构子模块 core.constants 并重命名为 core.configs

• Removed useless submodule standard._auxiliary
  移除了无用子模块 standard._auxiliary

• The function toolbox.set_mouse_position has been removed and will be moved to a different project in the future
  移除了函数 toolbox.set_mouse_position，后续会将其移动到其它项目中