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

[IMP]Improved some code as per coding convention.

[IMP]applied filter services on product view,changed position of to invoice div.

[IMP]used product.template instead of product.product and seted default_type service domain.

[IMP]Removed all domain from service menu

[IMP]used xmlid_to_res_id method,remove icon,improved typo.

[IMP]renamed is_escalate field to can_escalte and maked it none stored function field.

[REM]Removed use_timesheets field and replaced it with invoice_on_timesheets field bcoz use_timesheets used in some views not in model.

[IMP]maked simple label instead of invoice_on_timesheets field.

[IMP]Maked use_timesheets field as deprecated.
[IMP/REM]Removed def onchange_invoice_on_timesheets,xpath for invoice_on_timesheets,icon and improved typo.