Work on major task EXT-2808 (Add speakers moderation (both voice and text) to...

Work on major task EXT-2808 (Add speakers moderation (both voice and text) to the Voice Control Panel (Active Speakers List))
 -- Refactored moderating of text & voice chats to use the only LLHTTPClient::Responder class
 -- added doxygen comments for voice moderation functions

--HG--
branch : product-engine