[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
I don't like it : create a function `prepare_planner_event()` in the plannerDialog. Then, in planner_crm.js, override the method, and bind the `$('#input_element_pipeline').change(function(ev) ` event, if the current planner.type == 'planner_crm'.
And remove the js code in the template.