[crm] implementation planner

- Task: https://www.odoo.com/web/#id=8592&view_type=form&model=project.task&menu_id=3942&action=327
- Pad: https://pad.odoo.com/p/r.4BHh6hQdZ4GPR2qE
Wrong namespace (for all the file) : all object and class for the planner should be contained in instance.planner = {}. Then you will have, instance.planner.PlannerManager = ...