[MERGE][REF] survey: refactor survey page transition in ajax

Purpose
=======
To have a better UX, the transition between questions in a survey should not be done by loading another page, but by loading next questions in AJAX.

Specifications
===========
Do the transition in ajax, no more page loading:
- During submit, load and display next questions in a smooth transition (fade in / fade out).
- Include start and end screen of the survey inside the survey form (same process, load next screen in smooth transition)
- Integrate timer and start only after start survey.
- Integrate breadcrumb and handle manually (at frontend) transition about clickable / active / inactive breadcrumb item. Make the survey breadcrumb a widget to ease the navigation transitions and updates.
- Validate questions at frontend before sending data for submit. (to avoid fading out then fading in the same questions with error messages)

Also include some improvements and fixes :
- Save questions on time limit reached, to take into account unsubmitted answer (if user does not have time to click on submit)
- Block submit if survey has been already completed by the user.
- Do not use previous id on one page mode (fix)
- Remove display mode for simple choice question : that will prepare the next redesign of survey and allow to handle simple choice in a more standard way for all kind of question types.

See sub commit for more detail.

Task ID : 2152223

closes odoo/odoo#42908

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

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