reconnect infinitly when autoreconnect option is True. fixes #2411

do not ask confirmation window nor check if a row is selected when we close muc with /leave (or others) command. fixes #2528

PrivateChatControl now hold room name so that we can draw banner of pm even if room control has been closed. Fixes #2527

fix adjust_priority_with_status option: save when we change this option and correctly get autopriority_* values

do not do utf-8 twice; make sure before_/after_time/name possible newlines are taken into account in history window too

introduce GajimGeneralException and use that instead of RunTimeError when raising so instances are not created. This is better because python can also raise RunTimeError, which we will catch by accident and we do not want that to happen