Its enough to connect to the handle-local-options signal for what we
currently want to do.

If the JID is not in the DB we need a type to insert

New Style for Chat Windows

See merge request gajim/gajim!144

- Move ActionBar into HeaderMenu
- Make Design of ChatControl look cleaner
- Hide the Roster in Groupchats per default
- Add Button to hide/show Roster in Groupchats
- Move Groupchat topic into popover
- Display Avatars on the right side of the ChatControl and status on the
left
- Add a default Avatar for contacts that have none

the account name was passed instead of the account jid

- make it use get_jid_id() and return the jid_id

Use _jid_ids dict instead

- Cache jid_id so we save on DB querys

A special Client only publishes Images in this Format

Fixes #8762

We use PubSub only on our account jid, this use case is what PEP
was made for. If PEP is discovered we know that certain PubSub
features are supported, see: https://xmpp.org/extensions/xep-0163.html#defaults

The current check for <feature var='http://jabber.org/protocol/pubsub'/>
is pretty useless, as it just tells us that there is a PubSub implementation
but not much about the features. Only `publish` and `subscribe` are MUST
in XEP-0060 which is not enough for our needs.

If there is ever need to discover a generic PubSub implementation
that is not PEP we should check for all the PubSub features we need
instead of only for <feature var='http://jabber.org/protocol/pubsub'/>

see: https://xmpp.org/extensions/xep-0163.html#support

Fixes #8765

Moved to the gajim-plugins repository

Fixes #8761