BHoM_Adapter: UpdateProperty - return consistency with other methods

[alelom]

See also https://github.com/BHoM/BHoM_Adapter/issues/135

Broken rules:

The UpdateProperty interface returns the number of objects updated, while the Push returns the list of objects pushed (and therefore potentially updated). I am not sure this logic makes sense other than "We coded what we needed to get what we wanted" kind of way.

It's possible that the UpdateProperty return type has not changed since the Push was returning a boolean, as it has not been in use that much at all.

Suggested changes to restore compliance:

Change the return type of the UpdateProperty to return the List of objects with the updated properties.

Additional note

Note that UpdateProperty is implemented only in 3 Toolkits, so we can postpone this as explained also in my comment below.

[alelom]

I decided to postpone this change for now for 2 reasons:

• being consistent with other methods return type mainly means to be consistent with what the Read returns. I still want to think through that.
• this change only affect the 3 toolkits that actually implement UpdateProperty.

So this can be left even for after the main Adapter refactoring is completed.