Changes to Create Client Session

added the new optional request property app_name

added the new optional request property scopes

added the new gb enum value to the request property proxy_country

removed the enum value cz of the request property proxy_country

removed the enum value de of the request property proxy_country

removed the enum value es of the request property proxy_country

removed the enum value fr of the request property proxy_country

removed the enum value hu of the request property proxy_country

removed the enum value it of the request property proxy_country

removed the enum value pl of the request property proxy_country

removed the enum value ro of the request property proxy_country

removed the enum value sk of the request property proxy_country

removed the enum value ua of the request property proxy_country