[Yavor Doganov] name in gajim.desktop from Gajim now is Gajim Instant Messenger [as Gaim and Gossip do it]

auto_authorization is now keept in mem. This way it works correctly, but doesn't if you close gajim before your contact ask your auth. Fixes #1630

fix a TB in trayicon menu functionality. fix varname which lead to bad functionality for single message [we were doing new message] and also fix functionality for it, add %s in strings and not +, use gtkgui helper function

now we can save preset messages from change status message dialog. we also use ComboBox and not ComboBoxEntry because the first shows clearer that it is not editable. fixes #1407

when we open a message window by clicking popup menu or systray or doubble click on roster, treate it as long time ago message (don't show 2 seconds confirmation when closing it). Fixes #1591

( #1629 )

clear _expected dict when callback is called. This way when another stanza arrives with the same id, it isn't catched as expected.

preferences window is created on the fly like every other window (well apart from FT [TODO for that]); this is good as we do not want such window to sit in memory; also fix some border width and spacing in prefs window