This commit improves the live chat bundles:
- `core`
- `common`: hold files that are common to every feature
- `web`
- `standalone`: hold files for the embed live chat and is splitted
in 4 sub-bundles:
- `common`
- `frontend`: should only be added in the Odoo frontend.
- `external`: should only be added outside of Odoo
environment (e.g. support page).
- `cors`: should only be added when the live chat
is requested from a different origin.
This will make live chat folder structure closer than the one used
in mail and avoid code duplication.
task-3537697
closesodoo/odoo#138536
Signed-off-by: Matthieu Stockbauer (tsm) <tsm@odoo.com>