To complement the existing addSecs / MSecs / etc., add a function
that takes any compatible std::chrono::duration.
QTime also features similar functions, but it's also "unique" in that
it uses modular arithmetic (it wraps around in case of "overflow").
I'm not so sure that adding durations to a QTime object therefore
makes sense, and I'm not doing it in this patch.
[ChangeLog][QtCore][QDate] Added addDuration().
[ChangeLog][QtCore][QDateTime] Added addDuration().
Change-Id: I02aa37ff024d7f56fa976dc8f4f73523bdba8d94
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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