Delete some already ported methods

- use `with` statement and open() instead of os.open()
- execute run() on dialog, otherwise sys.exit() is called immediatly

getTimestamp() generates always a timestring with a resolution of seconds and
this means time gets always rounded down.
Because we use a resolution of .00000 precision for outgoing messages this
can lead to wrongly sorted messages.

Flatpak: bundle plugin installer

See merge request gajim/gajim!207

- use SendAndCallForResponse instead of triggering an Event
- validate iq result even more, it didnt print iq errors before

Add navigation for chat history

See merge request gajim/gajim!202

Fixes #8883

Use keyring module to also handle password storage on linux

See merge request gajim/gajim!206

We dont need to use the ::open handler to handle xmpp uris

Fixes #8881

Update flatpak file

See merge request gajim/gajim!204

Fixes #8878

Improvements for HiDPI

See merge request gajim/gajim!203

Philipp Hörist authored 7 years ago and Philipp Hörist committed 7 years ago

It will correctly scale on HiDPI Displays if we set it like that