[tabbar] added hotkeys for moving tabs
Merge pull request #238 from trett/master

[tabbar] added hotkeys for moving tabs
[chatsessionmodel] added sorting by role
[chatsessionmodel] added own priority
[chatsessionmodel] ver.3
Merge pull request #239 from trett/master

[chatsessionmodel] added sorting by role
Fixed recieving messages from another recources in MUC
Fixed MUC leaving after reconnection to server
Added user's avatar and senderName to conference notifications