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>

Issue

	- Install Contacts
	- In systray, open #general
	- Mention anyone (except your user)
	- Send
	- Click on the mention

	It does nothing

Cause

	In thread_window _onRedirect, we pass
	the _open method bounded to this.

	But this = the #general thread window
	so it will open the general thread again.

	As it is already open, it does nothing

Solution

	Modify the open method in order to
	receive the returned channelID and
	pass it to the call

OPW-2265580

closes odoo/odoo#52834

X-original-commit: 5957aa317e8bb5b0041a1b5d8256cb3ff7d9fe42
Signed-off-by: Jason Van Malder (jvm) <jvm@odoo.com>

The customizable "out of office" text was removed from the editable views as
part of task-2053585, but some places in the code were still using it, even
though it was never set anymore.

This commit removes the obsolete code.

Part of task-2171864

closes odoo/odoo#44968

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

Before this commit, when clicking on a channel mention from a chat
window, it crashed with the following error:

`TypeError: channel.detach is not a function`

This happens due to `MailService.joinChannel()` returning a promise
that is resolved with channel ID, instead of a channel object.
`channel.detach()` becomes `<Number>.detach()`, which is treated
like `undefined()`, hence crash.

closes odoo/odoo#44329

X-original-commit: 710fda06c3b30ff2267fcc1d123f15ce031b6f3a
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

This commit adds the out-of-office ribbon at the top of the
conversation in the discuss app.

Task-2066672

closes odoo/odoo#39362

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>
Co-authored-by: Mohammed Shekha <msh@odoo.com>

Before this commit, a channel in mobile with option "Send messages
by email" had no composer when opening in mobile.

This issue happened because channel views in mobile are in fact chat
windows. Chat windows with such channels do no display any composer,
which is intended in desktop.

This commit fixes the issue by enabling the extended composer for
chat windows with email channels, just for mobile.

opw-2059468

closes odoo/odoo#36120

Signed-off-by: Adrien Dieudonné (adr) <adr@odoo.com>

closes odoo/odoo#35119

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

Before this commit, chat window's out-of-office info did not change
when direct partner's `im_status` is/was on 'leave'.

Users had to reload page to see updated out-of-office info.

Task-ID 2007663