[FIX] im_livechat : clean cookie managment
[FIX] im_livechat : clean cookie managment

Update the cookie after changing conversation state
Deleting the conversation cookie when closing the conversation window
Force open the conversation if a cookie is found (even if the state is closed)

optima-ict/odoo,bplancher/odoo,microcom/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,microcom/odoo,ygol/odoo,laslabs/odoo,hip-odoo/odoo,optima-ict/odoo,microcom/odoo,sysadminmatmoz/OCB,stephen144/odoo,syci/OCB,hip-odoo/odoo,ygol/odoo,storm-computers/odoo,bplancher/odoo,syci/OCB,optima-ict/odoo,laslabs/odoo,storm-computers/odoo,syci/OCB,hip-odoo/odoo,microcom/odoo,storm-computers/odoo,microcom/odoo,hip-odoo/odoo,stephen144/odoo,microcom/odoo,Elico-Corp/odoo_OCB,laslabs/odoo,optima-ict/odoo,ygol/odoo,storm-computers/odoo,sysadminmatmoz/OCB,dfang/odoo,syci/OCB,ygol/odoo,dfang/odoo,Elico-Corp/odoo_OCB,stephen144/odoo,dfang/odoo,dfang/odoo,sysadminmatmoz/OCB,bplancher/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,syci/OCB,bplancher/odoo,sysadminmatmoz/OCB,Elico-Corp/odoo_OCB,dfang/odoo,optima-ict/odoo,stephen144/odoo,stephen144/odoo,stephen144/odoo,laslabs/odoo,storm-computers/odoo,hip-odoo/odoo,dfang/odoo,laslabs/odoo,optima-ict/odoo,ygol/odoo,sysadminmatmoz/OCB,bplancher/odoo,sysadminmatmoz/OCB,ygol/odoo,sysadminmatmoz/OCB,Elico-Corp/odoo_OCB,laslabs/odoo,syci/OCB,ygol/odoo,storm-computers/odoo