[REF][IMP] *: mail js refactoring

This commit improves the JS code of the mail module,
which comes maily from the new coding guidelines
and the addition of "JS services".

JS services are important objects that do not fit
well in the component tree, such as chat_manager
or ajax.

The benefits of JS services are improved readability
of the code, reduced coupling, and more testable
modules. In particular, discuss was hard to

Summary of the changes:

- ClientAction has been renamed into Discuss
- Clear instantiation of chatManager
- New coding guidelines in most mail modules
- JS Services can interact with each other
- Chat Manager and Window Manager are services
- Window Manager renamed to Chat Window Manager
- bus.bus is now encapsulated in Bus Service (a service)
- The test infrastructure has been tweaked with JS Services
- Chat Mixin has been removed

A future improvement would be to translate some 'trigger' into 'trigger_up'.

1 files changed, 1 insertions, 1 deletions

diff --git a/addons/mail/static/src/less/client_action.less b/addons/mail/static/src/less/discuss.less
index 0dd284afb90..a90d0df94bd 100644
--- a/addons/mail/static/src/less/client_action.less
+++ b/addons/mail/static/src/less/discuss.less
@@ -356,7 +356,7 @@
 }
 
 // ------------------------------------------------------------------
-// Channel preview: shared between client action (mobile) and systray
+// Channel preview: shared between discuss (mobile) and systray
 // ------------------------------------------------------------------
 
 .o_mail_channel_preview {