[REMOVE] mail: remove unused 'mail model' class
[REMOVE] mail: remove unused 'mail model' class

The intent of this class was to have all mail model be RPC/service calls out of
the box. This is a bit overkill for just 2 lines per new mail models, which is
why this is not used at all.

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo