QStateMachine: replace a QHash key involving a QPointer

Using QPointers (or any type that makes a QPointer part of its identity) as a key
in any associative container is wrong. They get externally set to nullptr,
violating the associative container's class invariants, which could lead to
data corruption, even though bucket-based hash implementations are less susceptible
than binary trees.

To fix, write a new class that acts much like the old QPair<QPointer<>,QByteArray>,
but uses the QPointer only as a guard, not as part of its identity. To preseve
identity, also saves the naked pointer originally passed and uses that for op==
and qHash().

Change-Id: I4fa5a6bf86bad8fe7f5abe53d7c7f3ad3754d8d6
Reviewed-by: Thiago Macieira <[email protected]>

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