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Signed-off-by: Linus Jahn <lnj@kaidan.im>

It help upgrading and/or maintaining correct Qml import modules version.
Signed-off-by: Linus Jahn <lnj@kaidan.im>

This should also fix all issues with word wrapping in chat messages.

Fixes #158.

This updates all copyright headers in the source files to 2018. Also,
there are not all contributors listed with a seperate copyright line,
only one line for all Kaidan developers and contributors with a 'link'
to a full list of contributors in the LICENSE file.

It would be very hard to maintain the old strategy and adding each
contributor to each file. Also the copyright lines were get too long then.

All Kaidan headings are uniform, now. I replaced 'A cross platform XMPP
client' with 'A user-friendly XMPP client for every device!'.

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.

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

The Sub/Unsub management in gloox is done in the Roster/RosterListener/RosterUpdater.
Therefore the PresenceHandler is currently useless. (Probably will change in the future)
Sub requests are accepted automatically and the user will be unsubbed on incoming unsub
requests (when the other entity unsubs from the user).

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

The new SQLite3 database is saved (on Linux) under:
~/.local/share/KaidanIM/kaidan/messages.sqlite3 (This is the AppData
location from Qt)

It currently has two tables one for the roster and one for messages.
The roster table has two coloumns: jid and name. The message table
has six: author, author_resource, recipient, recipient_resource,
timestamp and message. 'recipient' and 'author' contain a bare JID
(a JID without the resource) and the resource saved in
author/recipent_resource, if available. The resource is not really
necessary, but I thought it might be cool to add e.g. some stats for
this, later.

In the Kaidan.cpp/h, I moved the handleMessageReceived part into the
MessageController, later we should also move the handle Presence
Received into a PresenceController or something as this.

I also removed the 'import harbour.kaidan 1.0' in QML, because, now
we don't have any new QML-types from Kaidan -> you can't import it.

The Chat-GUI is still very ugly, we/I should definitely imporve it
in a later commit.

Closes #55.

Now Kaidan starts directly with opened roster, if you've typed in
your password once.

Add new global vars. for the organization name and domain:
ORGANIZATION_NAME:	"KaidanIM"
ORGANIZATION_DOMAIN:	"kaidanim.github.io"

Currently they are not used.

Closes #24.

Fixes #38.

I also had to adjust the README and of course the qrc-file.
In the qrc-file I adjusted the path and added an alias, so
all code remains compatible (we should add such aliases for
all files in there).

Closes #10.

* Disconnect account on exit
* Minor UI changes
* Fix indent

* Rename EchoBot to Kaidan
* Kaidan inherits QObject now
* Add RosterController and RosterItem
* Add minimal GUI for Roster (just a POC)