Nicegui

- introducing `on_request` callback for pages to provide session info (this [allows reauthentication through cookies](https://github.com/zauberzeug/nicegui/issues/15))
- mouse handler in `ui.annotation_tool` is now optional
- allow styling of `ui.annotation_tool` with tailwind and css
- use more default styling for `ui.chart`
- bug fixes

- introduce `page.route`
- allow passing page instance to `ui.link`

- introduction of `ui.chart` element
- adding support for dark mode
- upgraded to JustPy 0.2.3 (fixes 5)
- bugfixes

introducing annotation tool (clicking into image provides pixel coordinates)

- close menu after click on menu item
- bugfixes

- introduction of `ui.colors` to configure primary, secondary colors
- allow dynamic creation of elements (for example add `ui.joystick` on button click)
- updated dependant packages to latest versions (fixes PIL security warning)
- allowing the customization of Quasar classes which are applied to the main page through new `ui.run` parameter `main_page_classes`