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Fixes #131.

There was just one comma too much, that broke everything. Idk why I
haven't noticed that before ...

Fixes #132.

Don't use an explicit gpg key server.

Adds a short summary of what happened in the last two months (yey only
two instead of the normal 4 months).

I'm going to release it tomorrow. :)

Unfortunately SQLite3 doesn't support the 'simple' removal of one column
using `ALTER TABLE`, so we have to use a workaround. This is copying
everything except the `avatarHash` into a new table and then replacing
the old table with it.

This isn't needed anymore, since we populate the data via. Q_PROPERTIES
and the AvatarStorage.

This makes the avatars also rounded on the roster page.
I think this looks much better than the previous alternative with the
hard edges/corners.

This adds a new RoundImage QML type, that has a QtGraphicalEffect for
removing the corners and making it rounded (this is currently the only
way doing it, since an Image has no radius property as a Rectangle).

The avatar is now also a bit larger, I think it looks better so.
I removed mipmap filtering for the avatars on the ChatPage, because it
looked not good and a bit blurred on the avatars I tested it with. Maybe
I'll change that later again.

This will make it possible to show automatically updating avatars of a
specific JID. Also the avatar hashes don't have to be saved in the
message database anymore, and so problems when changing accounts are
fixed now.

The AvatarStorage now has a signal, that is emitted when the avatar of a JID
was changed. Connected to it is the NOTIFY signal of the Q_PROPERTY of
the avatar storage, so all avatars are updated then.

This changes the design of the ChatPage or the underlying ChatMessage
object to show the date and a green checkmark if delivered.

The green checkmark is from Conversations (GPLv3).

The time format is 'dd MMM, hh:mm' / '31 Dec, 23:59', but it would
probably be better if this format would be changed dynamically, so that
all messages of the current day only show hours and minutes and messages
older than one year also show the year.

Closes #103, closes #104.

This will improve the quality of the avatars, so they're not 'pixely'.
But of course this will cost more performance.

This will fetch the user's VCard on connection, will be needed to edit the VCard
e.g. for changing the avatar.

Whenever a subscribed contact has changed its avatar/photo in its VCard according to XEP-0154:
vCard-Based Avatars, a presence info is sent to the client. This will cause the VCardManager now to
request the new VCard and so updating the avatar.

XEP-0154: vCard-Based Avatars:
https://xmpp.org/extensions/xep-0153.html
https://camaya.net/api/gloox/classgloox_1_1VCardUpdate.html

This fixes that the avatars couldn't be written and read, if the directory hasn't exist
before.

This implements XEP-0054: vcard-temp, but only handles the avatar/profile picture.
Avatars (and everything else in the VCard) will currently only be updated on connecting.
For changing this, we need to implement XEP-0153: vCard-Based Avatars, that will send
presences with notices of updated VCards.

This storage is able to save QByteArrays for identifiers and restore them.
You can get a path to the file by the identifier (JID) or the SHA3-256 hexadecimal hash,
that is used for naming the files.
These avatars are saved in an "avatars" subfolder in Qt's cache location.

The new roster page displays the last message with the contact.

Since the apt command is now "finished" (e.g. full bash tab completion) in debian stretch,
we can use it now.

Message carbons allow you to receive the outgoing message of another client of the
same account. In short: messages are synced between the clients.

The handleMessage function of the MessageHandler can now handle both types of messages,
normal, direct messages by a contact and forwarded messages (possibly) written from the same
account.

Notfications and unread message counters are only used, if the message written by somebody
else, so you're not getting annoyed by notifications of your own messages. :)

Closes #116.

The management of the lastMessage and the unreadMessageCount for each contact are now
located in the MessageHandler. This fixes that these functions were not called and the
features were not usable.

Updated all dependecies and the description.

Now the QML API documentation is up to date again with the gloox rewrite.

It covers both implementations: XEP-0091 (deprecated) and the new XEP-0203.

This new XmlLogHandler will print all incoming and outgoing
XML in a pretty format onto the console. It's using the QXml module.