- Conference parameters : Change proxy config into account. Deprecate proxy config on linphone_conference_params_get_proxy_cfg().
- Conference parameters : add default and custom factory URI, aswell of identity coming from account.
- LinphoneAddress : add isValid() to public API.
- Create conference : creation from "conference_type" on default proxy (unchange). If not set, use factory from conference parameters. If factory is not valid then it is a local conference.