tao@0.21.0

81329013(#743) On macOS, fix the unexpected shifting of the window when dragging after closing the share dialog.
baa02977(#418) Added APIs for setting progress bars for the application icon on Linux (Unity only) and macOS, along with progress indicator for specific window on Windows.
8f361f0c(#752) Handle universal links on iOS and send Event::Opened { urls }.
bb3c53d1(#764) On macOS, fix SystemTrayEvent not emitted after calling set_menu.
5af3da4a(#746) On macOS, force NativeImage height to be 18 to have consistent size for all icons and match custom icons.
093d8fbc(#422) Implement Event::Opened on macOS for file association and deeplink support.
e9875fe5(#755) On Windows, fix leak of tao::system_tray::Icon when calling tao::system_tray::SystemTray::set_icon and leak of String when calling tao::system_tray::SystemTray::set_tooltip.
50e69d71(#749) On Windows, fix disabling resizable also disabling maximize button and messing up Window::set_maximized.