* Introduction of LinphoneFactory singleton class to create
  core-independent object like LinphoneAddress or LinphoneVcard.
* Make several C structures inherite from belle_sip_object_t class:
	* LinphoneCore
	* LinphoneVcard
	* LinphoneAuthInfo
* Creation of the LinphoneCoreCbs class that enable to store the
  callbacks used by LinphoneCore.

This is causing undefined behaviors in belle-sip and SAL.

if store_ha1_password option is set, then never store clear text password. Also whenever realm is known, compute the ha1 and drop the clear text password.

When ha1 password storage is enabled (the default), the lookup of LinphoneAuthInfo must be done with realm, otherwise the password will not work.

For functions returning or taking an MSList as an argument, specify what the MSList contains in the documentation.

fix failed tests in case of failed authentication.

Fix authInfo research + allow multiples authInfos with same username/password (with different domains) in linphonerc

Force value in user application after core creation in order to
prevent the passwords to be stored.

save some config parameter sooner.