[Merge] lp:~nick-dedekind/qtubuntu/menuTheme into lp:qtubuntu

[Gerry Boland]

> > std::optional is nice to avoid such munging of set/unset with value.
> >
> 
> C++17 only.

Damnit yes.

> I'll sort out the namespacing in another MP I; along with changes to 
> the logging categories. For now i've just left them in the current format.

Ok.
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https://code.launchpad.net/~nick-dedekind/qtubuntu/menuTheme/+merge/296997
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