Regression from gajim/gajim@79716f42

New Emoticons Menu

See merge request !102

Move src/ to gajim/

See merge request !103

This is a regression from gajim/gajim@9dc389cc

previously we used load_icon() which raises an exception for missing icons

now we use lookup_icon() which does not, and iconinfo can be None now

To use GStreamer we need to call Gst.Init().
We call Gst.Init() only when Farstream is available.

Fixes #8663

https://tools.ietf.org/html/rfc7622#section-3.2

Update JingleFT support, and fix sending files

See merge request !89

'channel-insecure-symbolic' icon if no encryption is selected

'channel-secure-symbolic' if an encryption is selected

Fixes #8652