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This bring support for:
- Sharing / previewing location
- Creating / sharing camera still images
- Creating / sharing recorded microphone audio
- Creating / sharing recorded camera video clip

Task-Id: #287Signed-off-by: Linus Jahn <lnj@kaidan.im>

Both send media sheet and chat message now share preview code.

Task-Id: #287Signed-off-by: Linus Jahn <lnj@kaidan.im>

Co-authored-by: Robert Maerkisch <zatroxde@protonmail.ch>
Co-authored-by: Linus Jahn <lnj@kaidan.im>

Co-authored-by: Linus Jahn <lnj@kaidan.im>

Co-authored-by: Melvin Keskin <melvo@olomono.de>
Co-authored-by: Jonah Brüchert <jbb@kaidan.im>

This reverts commit ede2b766.

Images are now displayed in the chat. For the case that they are
available locally (currently only possible by sending them), the images
are loaded directly, otherwise they're loaded via. HTTP. Of course that
still needs to be changed since those images are not cached and thus are
downloaded every time.

Fixes the `mediaLocation` attribute in the database of messages; it's
now the full file path, before it was accidently set to the folder's
path.

The colour for timestamp labels of incoming messages wasn't clearly
visible in some configurations, it is now always a bit darker (1.3
times) and well visible in all common styles.

Closes #220.

The About dialog change fixes bigger logo display. It replaces
an OverlaySheet, which was used in a way conflicting with
Kirigami HIG. As a bonus, it is able to change layout direction
depending on screen size.

Replace close button with round button; see #154.

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.

* Roster: Add confirmation dialog for contact del.

Closes #69.

The new cmake option is `-DSAILFISH_OS=1`.

Enable High DPI Scaling

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.