Fix xmpp: URI handling.

See merge request gajim/gajim!170

Remove gajim-remote.desktop and fix gajim.desktop

See merge request gajim/gajim!169

It was previously removing the first three characters of the JID, and
ignored any URI without an action.

Remove support for AWN

See merge request gajim/gajim!168

Port logind_listener to GTK dbus

See merge request gajim/gajim!167

connected before connection broke

Using a callback to display a sent message inside the ChatControl means
that all messages we send have to be issued from the GUI layer
(send_message()) if we want them to display in the ChatControl.

This replaces the callback and catches the stanza-message-outgoing event
after it was processed by the core.

This is easier to read/understand than dealing with callbacks and lets
the core issue messages without having to care if a ChatControl is open or not

Remove upower_listener

See merge request gajim/gajim!166

the 'Sleeping' signal has been removed from UPower about four years ago
https://cgit.freedesktop.org/upower/commit/src/org.freedesktop.UPower.xml?id=1ee642e705a63f5ad56a6b55e4bf5c4a64c959b8

Bugfix in printing fuzzy time.

See merge request gajim/gajim!165

Get location with GeoClue2

Closes #8772

See merge request !164

New JoinGroupchat/StartChat Dialog

See merge request !161

- Complete rewrite of the old Groupchat dialog
- Has now a "minimal" mode, which is used if we have all infos for joining except the nickname and if we want to bookmark
- Handle xmpp uris received via command line

Clients should only upload square sized avatars

argument)

Fix appearance of status icon in MATE

Closes #8757

See merge request gajim/gajim!163

Tested in Debian testing (Buster) with gtk2 based MATE 1.12,
gtk3 based 1.16 and 1.18.

Moreover the used environment variable is depreacated already in 1.12:
$ echo $MATE_DESKTOP_SESSION_ID
this-is-deprecated

Fixes #8757

refactor the way we call SQL

See merge request gajim/gajim!162