[MERGE][IMP] survey: add a 'live session' mode to the survey app

PURPOSE

Add a "live session" mode for survey that allows the host to interact with its
audience. He controls the pace of the survey and the audience answers questions
one at a time.

Results for each question can be displayed by the host to adapt his speech in
real time.

A gamification component even allows to give points to the attendees, based on
the quickness of their answer, and create ranking to keep everyone's attention.

SPECIFICATIONS

This whole feature is deeply integrated within survey. It adds a layer of
"survey session" on top if it that gathers attendees and answers during
the lifespan of the session.

In addition, we fixed/pimped several survey features:
- we now prevent 'enter' submit when survey is done to avoid a raise.
- we made a few small improvements on the frontend views
- we now correctly remove the timer and initialize the result
  widget when the user presses 'enter' on the last page / question.

See sub-commits for details.

Task 1972640

closes odoo/odoo#43568

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

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