emoticons_menu is created only once, and correctly destroyed when we change emoticon theme. (It was never destroyed before -> memory leak)

transfers

(#1796)

remove many call to dialog.run() function. Some are still here, but they happend only when the user do an action (close a chat window, change status, ...). So UI is not blocked when we receive a groupchat invitation or an error message.

fix logic in handle_event_msg so messages from lower resource doesn't behaves incorrectly. Fixes #1785