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Clean up all includes and don't use "Swiften/Swiften.h" anymore.
This will speed up builds much.

It wasn't working to add the kaidan repo before on systems
without `software-properties-common`.

Next will be to get all storages (roster, history, vcards, ...) from these MemoryStorages.
And then we can replace these MemoryStorages with real FileStorages, so you can see
everything even if you're offline.

I added a new include for the PlatformCryptoProvider; we should clean up all includes and
only use specific files instead of just everything from Swiften: this will speed up
compilation much!

* Roster: Add confirmation dialog for contact del.

Currently translated at 100.0% (31 of 31 strings)

The new `lastExchanged` coloumn in the RosterModel contains
a ISODate string with the time when the last message has
arrived or has been sent. The roster is now sorted using this
property.

The message controller is now able to communicate with the roster
controller directly and updates the lastExchanged whenever a
message arrives/is been sent.

To preserve the lastExchanged property, the roster is now only
'updated' instead of being replaced every login. It looks up
which JIDs have been removed and added, adds/removes them
and updates the name of all the others (lastExchanged keeps the
same). Roster Versioning would be the better solution here and
also generally ...

Currently translated at 100.0% (18 of 18 strings)

This adds notifications using libnotify, but not native (it's only executing the command).
The new dependency is: `libnotify-bin`

Another TODO is to resolve the nicknames from the JIDs.

This will now announce that Kaidan has the message delivery
receipts feature and that Kaidan is a client of type pc.

For more information about XEP-0030, see:
https://xmpp.org/extensions/xep-0030.html

Now there are three status values in the DB: isSent, isDelivered, isRead.
This will make the DB uncompatible again. (You'll have to delete/recreate it!)

For information about XEP-0184 see this:
https://xmpp.org/extensions/xep-0184.html

New messages will be marked as read on loading.
This commit makes the DB uncompatible, it's the best if you delete it
and restart Kaidan. (Later we should convert old DBs)

Old messages will leave compatible.

I also cleaned the .h a bit up, there were some unused
vars declared.