This commit is a significant rewriting of client-side discuss, chatter,
chat window, and messaging menu using OWL. The behavior should be broadly
the same, with some slight functional changes here and there.

From a technical standpoint, the code of messaging is mainly organized in 2
main groups of modules:

- models, which are logical entities that depict the client-side state of
  messaging as a whole.
- components, which are in charge of displaying information from models.

This refactoring also introduces new JS guidelines regarding folder structure
(/static) and naming rules for JS modules.

Community PR: https://github.com/odoo/odoo/pull/39023
Enterprise PR: https://github.com/odoo/enterprise/pull/6249

Task-1914207

This PR is a collaborative work by Alexandre, Julien, Sébastien and Xavier,
with the precious help of Lucas to speed it up towards the end.

closes odoo/odoo#39023

Related: odoo/enterprise#6249
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>
Co-authored-by: Alexandre Kühn <aku@odoo.com>
Co-authored-by: Julien Giannone <jgi@odoo.com>
Co-authored-by: Lucas Perais <lpe@odoo.com>
Co-authored-by: Sébastien Theys <seb@odoo.com>
Co-authored-by: Xavier Dubuc <xdu@odoo.com>

- Rename the 'Use Rating on Project' feature into 'Customer Ratings'
- Rename the 'Set Email Template to Stages' link to 'Set a Rating Email Template on Stages'
- Add an optional list view for the Stages menu
- display warning if the rating_template_id field is set and if one of the selected project_ids doesn't have the rating_status field set to true
- Project form view revamp
- rename the '% on tasks' stat button into 'Customer Satisfaction'
- Remove the 'no option' for the rating frequency field because it is required
- project form : Add a 'Go to Website' stat button
- Project dashboard: remove the 'Customer Ratings' menu item in more
- Ratings page: the 'Last 30 days' filter include ratings from today
- remove the Appointment / Helpdesk Customer Satisfaction / Live Support menu items

TASK ID : 1251

This commit adds a placeholder to the field where the visitor has to put his email
to be more self speaking. (Otherwise, the visitor could not know what to put on this field)

Task ID: 2076656
PR #37511

When a visitor close the livechat and submit a review,
the "Send" button is not styled.

closes odoo/odoo#36487

Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

after this commit user can get a copy of the conversation with operator

task-2029660
closes #34620

closes odoo/odoo#35083

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

Currently, layout for rating a chat is not looking so well.
This commit improves the rating layout. It will
 - Center the content (including smileys)
 - Enlarge the fonts (a little bit)
 - Underline the link instead of using italics (more intuitive)

Task : 1838321
PR : #24413

opw-658973

Refactoring of the livechat itself and integration in the new architecture of
mail since its large refactoring.

Joint work with ged