Make the best effort to find a conference that can be linked to an INVITE session. In some cases, the account contact address doesn't match neither the conference ID peer address nor the conference address therefore the core now looks also at the To or From headers

Add backward compatibility code for tchat conference server based on SDK release/5.3. In fact, the GRUU parameter must be added to the To header of a SUBSCRIBE and MESSAGE messages
Comment code needed to remove the gr parameter from the conference address and conference ID that can be used once a tchat flexisip conference server based on SDK 5.4 will be released

Add setting to keep GRUU in chatroom and conference addresses and conference IDs

Do not use anymore local address as contact address of SUBSCRIBE and PUBLISH messages