single pref win: move eip preferences to new combined preference window.
single pref win: enabled/disable services via preferences window, account page.
single pref win: moved password change UI to a separate window, opened from account page in preferences.
single pref win: gets the autopep8 beauty scrub.
single pref win: clean up vpn pref error displaying & don't show dummy gateways in case of error.
single pref win: move preference window tracking to PreferencesWindow
single pref win: minor linting & add changes file
single pref win: added shortcut to preferences
single pref win: ensure proper deletion of preference window pages.
single pref win: fix problems with cleaning up closed windows (lambdas were keeping the python object from getting garbage collected, and this keeps the old signal connections active)
country flags: add default fallback xx.png flag.
Merge remote-tracking branch 'elijah/feature/prefui' into develop