Port away from QMutexLocker in public headers

We can't use qt_scoped_lock/qt_unique_lock here, so port to
std::unique_lock and std::lock_guard for now.

This is in preparation of deprecating QMutexLocker in favor
of std::unique_lock and std::scoped_lock.

In QFutureInterface, change the return type of mutex() from
QMutex* to QMutex&, so we don't need to deref when passing
to std::lock_guard. We need to keep the old method around
for BC reasons, so the new one needs an artificial function
argument for disambiguation. This will vanish come Qt 6.

Change-Id: I1a0f0205952a249512ec2dbd3f0f48dd209b1636
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

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