Use of blocks in form widget

[hennan929]

The problem to solve

I need to modify the html of the form-widget to modify the submit button. To avoid breaking the module with future updates it would be nice to have blocks to be able to overwrite it safely.

Proposed solution

Move the current widget.html code from form-widget to widgetBase.html and extend it in widget.html. Add blocks in so you can overwrite them from widget.html. My main interest is to be able to overwrite the submit button.