[Interest] Preventing Multiple Instances of EXE

[Nye]

Hello,
This is ordinarily done with the help of a global locking primitive (for
example a global mutex). On the first run the mutex would be locked, and if
locking fails on the second one, you just exit the application.
IMPORTANT: As any global resource, special care should be taken to release
it in case of expected or unexpected program shutdown.

As for a Qt-way of doing this, you could try QSystemSemaphore (
http://doc.qt.io/qt-5/qsystemsemaphore.html).

Kind regards.
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