Fixes and optimizations
- fix leakage of ServerGroupChatRoom, resulting in the conference server using 100% cpu for several seconds just to find list subscription handlers. - replace unefficient use of std::list managing list subscriptions by std::unordered_map - fix very costly == operator of ConferenceId and IdentityAddress, as they were instanciating a Address (wrapping belle_sip_header_address_t) in toString(). This change should greatly improve the chat rooms load time.
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