This commit impact crm, website, website_sale and web_planner modules because it
- add planner for website and website_sale
- improve planner notebook by setting texterea and input size to 100% and using col-md-* class
- split js code into common part (used in backend and frontend) and backend part (only for backend)
- adapt some tour, since every page will have the planner modal in its DOM, the tour selectors msut be more accurate
- introduce some style fixes and adaptations
- ...
