[Azoth Murm] Method for setting MUC title.
[Azoth Murm] Support MUC renames.
[Azoth Murm] Handle code 51 messages.
[Azoth Murm] React to MUC changes.
[Azoth Murm] VkEntry::ReemitGroups().
[Azoth Murm] Fixed VkChatEntry::HandleRemoved().
[Azoth Murm] Proper VkChatEntry::HandleAdded().
[Azoth Murm] Reemit MUC participant groups on MUC rename.
[Azoth Murm] Don't butthurt about 6 and 7 codes.
[Azoth Murm] VkConnection::AddChatUser().
[Azoth Murm] Implemented VkChatEntry::InviteToMUC().