chat-ui: add info_bar_vbox on the top of the widget
chat-ui: add info_bar_vbox on the top of the widget

This VBox will be used to display info bars.

Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets