Return Task<T> from wrapper operations #54
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This means that every operation provided by the QCoro wrapper
classes now returns a Task<T>, so it's possible to use .then()
continuations with any operations provided by QCoro, e.g.
qCoro(socket).waitForConnected(then([](bool ok) { ... });
Previously qCoro(socket).waitForConnected() would return an
instance of QCoroAbstractSocket::WaitForConectedOperation,
which is an implementation detail of QCoro, which makes it
hard to combine it with functions (not coroutines!) that
return Task<T> and makes it much harder to support .then()
continuations everywhere.
Apparently, QPointer::get() has been introduced in Qt6.
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