Master res state cleaning mme

Hello sir,

  I have clean res.country.state.

    - remove res.country.state model
    - remove res.country.state reference in all modules
    - replace all many2one state_ids field by a char field
    - Use state char input field instead of select box in website_sale
    - Use country char input field insted of select box with loose auto completion in website_sale

Thanks,
mme-odoo