Master crm lost reason fwi

- Task: https://www.odoo.com/web#id=10074&view_type=form&model=project.task&menu_id=3942&action=327
- Pad: https://pad.odoo.com/p/r.x8Litps7bTGiQPzF
Please rename to crm.lost_reason; otherwise it is like having a "lost" subcategory in crm. You can also add a _description, that is the short description of the model.