[REF] mail, *: refactor messaging with OWL

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>

1 files changed, 6 insertions, 0 deletions

diff --git a/addons/mail_bot/static/src/bugfix/bugfix.scss b/addons/mail_bot/static/src/bugfix/bugfix.scss
new file mode 100644
index 00000000000..c4272e527b4
--- /dev/null
+++ b/addons/mail_bot/static/src/bugfix/bugfix.scss
@@ -0,0 +1,6 @@
+/**
+* This file allows introducing new styles without contaminating other files.
+* This is useful when bug fixing requires adding new components for instance in
+* stable versions of Odoo. Any style that is defined in this file should be isolated
+* in its own file in master.
+*/