-QApplication, no QGuiApplication: the later avoids the systray to
display
- Workaround for invisible app icons when vendoring
- Make border visible for snaps

we've agreed that the autostart behaviour can be unexpected;
we'll expose the ability under preferences (it can be controlled via cli
right now).

The C++ library does interpret anything as strings, we want to keep the
orignal json types.

Also disable autostart if manual quit, remove custom printer that was
used for i18n and disable previous autostart if -disable-autostart

We didn't disable autostart after the migration to qt.

- Resolves: #355 #289

It lacks authentication, and I need to debug a segfault/abort when
quitting. But kind of useful for demonstration purposes.

- Resolves: #243

Signed-off-by: kali kaneko (leap communications) <kali@leap.se>

Signed-off-by: kali kaneko (leap communications) <kali@leap.se>

Signed-off-by: kali kaneko (leap communications) <kali@leap.se>

Signed-off-by: kali kaneko (leap communications) <kali@leap.se>

Signed-off-by: kali kaneko (leap communications) <kali@leap.se>