Some interventions are done on a regular basis (e.g. maintenance of
fire alarms, safety inspections). Having tasks auto-generate would
facilitate the process and would ensure that the next intervention
isn't missed/forgotten.

closes odoo/odoo#55517

Taskid: 2172156
Related: odoo/enterprise#12246
Related: odoo/upgrade#1604
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

Previously, we could only set cover image on the kanban view of project
task. This commit makes the feature generic so now cover image can be
added to any kanban view.

Technical notes:
- field used to display the cover image has to be set as 'data-field'
  attribute on the kanban dropdown's  menu related to cover image
- developer will have to take care while designing kanban views with
  cover image ability in such a way that it does not break the design

Task 32108

closes odoo/odoo#31731

Signed-off-by: Martin Geubelle (mge) <mge@openerp.com>

Since rev. odoo/odoo@f4d541e the `session_id` cookie uses the `httponly` flag so
it cannot be accessed through client side script. But before this rev. the
`session_id` was still provided by the server to the webclient (in session_info,
mostly) and was stored and accessible. This made XSS injection more
dangerous than they should be as it was very easy to steal the `session_id`.

As the browser automatically set the `session_id` on every request to the server,
the webclient shouldn't need any explicit reference.

The system completely changed. I also had to adapt classes to new
screen breakpoints.

hidden/hide -> d-none
show -> d-block
hidden-xs -> d-none d-md-(block/inline/...)
hidden-sm -> d-md-none d-lg-(block/inline/...)
hidden-md -> d-lg-none d-xl-(block/inline/...)
hidden-lg -> d-xl-none
visible-xs-* -> d-* d-md-none
visible-sm-* -> d-none d-md-* d-lg-none
visible-md-* -> d-none d-lg-* d-xl-none
visible-lg-* -> d-none d-xl-*
hidden-print -> d-print-none
visible-print-* -> d-none d-print-*
...
and all possible combination of those had to be handled too.

Today, Odoo is really tricky to use without seeing the screen, it must be improved to be usable.

This PR forbid to use labels without a "for" attribute, add some title, rule and aria attributes in HTML. With that, Odoo will be fully usable with a screen reader.


* [IMP] Labels must have a for attribute. Improve accessibility.
* [IMP] Better error message when trying to read a missing cached value
* [FIX] Add some aria-label and title attributes for screen readers.
* [FIX] Template name is not included in the error message in case of SyntaxError in QWeb
* [FIX] Improve the Tour failed at step error message to be more explicit.
* [IMP] Add aria-labels
* [FIX] Add missing aria-label on failing test
* [IMP] aria-hidden means hidden. Fix all bad aria-hidden and hide aria-hidden for all.
* [IMP] Color names on kanban views and many2many tags
* [IMP] Add some checks on views for accessibility.
* [IMP] Add `alt` attribute on `img` tags.
* [IMP] Add aria-label and title on non-described icons
* [IMP] Add button role to widgets with btn class
* [IMP] Translate aria and formatted attributes.
* [IMP] Remove wrong aria-labelledby
* [IMP] Add menu role on dropdowns
* [IMP] Buttons must be focusable
* [IMP] Add aria attributes on progress bars
* [IMP] Improve accessibility of basic widgets
* [IMP] Change main layout to more semantic tags
* [IMP] Add menuitem role when missing
* [IMP] Remove wrong role='presentation'
* [IMP] Improve accessibility of tab panels
* [IMP] Add aria-invalid on invalid fields
* [IMP] Add aria-sort on ordered columns
* [IMP] Add role on alerts
* [IMP] Use dialog role, header, main and footer tags for modals
* [IMP] Add labels on o_status
* [IMP] Improve accessibility of kanban view with feeds and articles
* [IMP] Add alerts in case of new messages
* [IMP] Add widget, navigation or img role to aria-labelled items

Purpose
=======

If there is no picture attached to a task, the user doesn't understand how to add a cover image.

Sepecification
==============

- "Select" button to select image => Display only if we have images

- "Remove Cover Image" => Display only if image already set

- "Upload and Set" =>  Always visible , highlight button if no images. Image uploaded via dailog box should automatically set on task kanban and add to the "Attachments" in task.

 from project task kanban view (PR #17165)

* Fix the grid display of images (use the column property)
* Use Dialog class
* Allow removing a cover image
* Add image selection before choosing it (or double click to choose)

+ add less mixins in web for columns property

We don't want the dispayed image to be set to the last attached image but we want to be able to choose it.