Refactor GUI wrapper for Brython

[reingart]

We're using the Brython dialog widget in some sample apps: TWP50

This requires to build on the fly the UI with HTML, and introduce more concepts

A simplified class to create widgets would be great

If it could mimic Tkinter, GTK, WxPython or QT it would be great, so advanced student could practice in his own notebook.
Or a web alternative could be used JQueryUI

Original exercises are written in Tkinter, see for example #217 and #218, see original code for objects and methods that would need to implement: TWP50

For a preliminary tkinter Brython port see: https://github.com/PierreQuentel/tkinter

[augustofavrearg]

Buenas, Mariano. Después de ver los issues tanto de PyAfipWs y PyZombies, considero que mis competencias van mas con este issue en particular, tengo experiencia trabajando con Tkinter, Qt y JQuery. Me gustaria que me asignaras este issue.

Completare mi borrador con una propuesta para el.