GitLab

- Parse datetime correctly and convert to int
- Query contact keys on openpgp activation

- dont pass Path instance to sqlite3.connect()
- add keydate to devicelist publish

- Dont use armor when encrypting
- Convert timestamp to int
- Fix getting the default trust

It freezes Gajim and is not needed in Gtk3

The plugin did not work with Gajim 1.0.3, but will now with Gajim 1.1.0

Fixes #267