[PyQt] I'm seeing some strange behaviour whenever I quit my PyQt5 application

[Xavion]

Thanks for the helpful advice, guys.  The main problem was that the crash
was preventing my QSettings from being written to disk on exit.  I've
overcome this by force-calling a "sync()" on them beforehand.

I've installed Florian's "qt5-base-debug" package, which indeed does fix
the second (i.e. "QDBusMetaType") crash.  WIth it no longer in existence, I
was able to narrow down the cause(s) of the first (i.e. QPropertyAnimation)
one.  I then created a bug report about it
<https://bugreports.qt.io/browse/QTBUG-55922> on the Qt website.

Had I not been able to narrow down the problem - based on Florian's advice
- it's nice to know that I had Chris' as a fallback option :-).  I will
keep the latter in mind in case something like this happens in future.
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