Fix output decoding (and encoding)

[LSaldyt]

Allow semantic labels for the bitstrings generated during measurement of quantum states.

[LSaldyt]

Better yet, reverse-mapping will allow full measurements, even of custom datatypes

[LSaldyt]

Now that custom datatypes have existed.. I think that the "Memory" object might be capable of decoding into semantic values. So finishing this issue is a matter of adding a method or two to that object