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This reverts commit 16dadb5f.

* 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 tries to replicate a reported issue where the HELLO packet was never repeated.
This commit also fixes the assert of SAS code equality, that was passed only if SAS are known.
A zrtp call without SAS would pass the test before.

add_video() no longer exists and is replaced by request_video(), since this function doesn't guarantee video to be established depending on receiver's policy.
Also, it no longer modifies the video policy, for clarity. Instead, it uses linphone_core_accept_call_update() to accept video despite of video policy.

Repair call where a connection loss occurs on the caller side by sending a new INVITE with a Replaces header.

Add non regression tests for this.

media_localip is guessed from signaling using call->dest_proxy. This ease the use of liblinphone on a machine with two interfaces (typically a one being a vpn).
Clean things around sal.c and sal_impl.c