Sundash

Rewrite the whole framework from scratch.
Major changes in abstractions boundaries and their interfaces.

* (fix) Callback management, session/component/layout isolation now works great
* (fix) Reimplement the scheduler
* (chore) Numerous small upgrades

* (feat) Handling form inputs
* (feat) Working with static tables
* (fix) Update staticfiles serving, more graceful shutdown

First working version when install as 3rd party lib through pip

* (chore): remove Parcel
* (fix): fix frontend building
* (refactor): small updates on router component prototype

* (fix) Resolve problem with user session isolation
* (rnd) Prototype of layout switching (check coiny)
* (examples) New example: Coiny! Check `python -m examples coiny`
* (chore) Frontend CSS styles update, now dark theme
* (chore) Prettier server logs
* (refator) Clean up core part, layout, server

Publish package to pypi, update project metadata

* Remeke the whole backend code.
* Now correctly working with user sessions (there are still bugs).
* New interface for variables schema in components
* Queue communication replaced to chain-like callback calls, now easy to bebug
* Implement user interaction with app (buttons)
* New example: counter! Check `examples._01_counter`
* Oh-oh, clock not working at now, because scheduler not so important feat, TBD