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The database now crashes Kaidan when an invalid version number should
be saved and when an existing table should be created.

Previously it caused issue #378. As soon as support for Qt 5.12 is dropped, we should revert this commit.

Fixes #378

Fixes #374

* Add the necessary infrastructure to support multi page settings

There seems to be no reason to stick to the old header guards.

I didn't change the header files from qxmpp-exts or hsluv-c since those
projects don't use #pragma once.

Newer Kirigami versions have a separate header area.
Currently we are not using it in many places, which doesn't look too great.

As requested by sysadmins.
We are technically using the wrong platform for our deployment builds
(we need to move everything to the binary-factory),
and we are blocking valuable ci time.

* use m_
* remove get from getters

The changes in other files than Kaidan.cpp and Kaidan.h are just fallout from renaming some functions in the api of the Kaidan class.

* Add actions for opening chat and marking messages as read
* Do not notify for new messages when sender is muted or chat with sender is already opened
Co-authored-by: Jonah Brüchert <jbb.prv@gmx.de>
Co-authored-by: caca hueto <cacahueto@olomono.de>
Co-authored-by: Linus Jahn <lnj@kaidan.im>

This approach works for all kinds of names and does not change an intended lower or upper case.
Therefore, names like "1" and "a" are displayed now and "ab", "aB" and "AB" are not modified anymore.

Fixes #347.

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"