[Pas2js] Webwidgets demo

[Michael Van Canneyt]

On Sat, 29 Aug 2020, Mgr. Janusz Chmiel wrote:

> Thank you for The demos. It is very good source to demonstrate yours unit
> and code also contain useful parts to learn The programmers techniques how
> to work with widgets.

I have added a demo for some bootstrap-based components in the webwidgets demos.

If you look at the demobootstrap.pp unit, and in particular the TToastManagerDemo class, 
you'll see how you can actually use the classes: there you'll have some code which
resembles "real-life" code.

Michael.