list  in systray context menu

get_completion_liststore in gtkgui_helpers

Even if we are using notifications, we still want to see awaiting chats when clicking systray -> show events or left
click

NodeBuilder are callected when we close the
connection

Nicer systray tooltip when awaiting events of differents types (don't print gajim twice). Fixes #1053

files, which are now located in data/glade/

what a silly typo!

for transports. fixes #1903