All Typed Debugger `New value` input fields share underlying value

I'm on 77d97eb28999d4b8f865653f505b9bed143d2b48

If you load a data type and change one field, all of the values in all the input fields change.

Looking at the code, this is because they all write to `m_newValue` private member so it's not surprising.

Presumably we need input text storage for each label and have them all be separate. Maybe a map from address to value or whatever.