[IMP]improved some view:project form view,Task form view ,project kaban view, Contract form view and payment,and Chatter of project form view

- Task: https://www.odoo.com/web#id=5179&view_type=form&model=project.task&action=333&active_id=131
- Pad: https://pad.odoo.com/p/r.ZQjz4rt8LM4wWksi
ok, i have removed  "def onchange_invoice_on_timesheets" because i have already added into hr_timesheet.py.