[MERGE] rating,project: rating as project dependency

Impacted modules: rating_project, project, sale_service_rating,
website_rating_project and rating.

This merge remove some small modules to integrate them
directly into big one; indeed, we wanted to set rating as
dependency of project module.

As consequence, we see:
- rating_project is removed (its features) are included in
project, hidden with a group
- sale_service_rating is absorbed by sale_timesheet
- website_rating_project is moved into project too, so the
rating page does not depends on website anymore

No feature change, simply moving code, and reorganize some ;)

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