undo/device: adjust device management infrastructure

We no longer need the remove infrastructure, and the edit nickname function
becomes much more intuitive to use by passing in the dive computer for
which we want to create a nickname instead of the internal index into
the array of devices.

This also removes / simplifies the device list update signals in the
DiveListNotifier.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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