this will become a proper specialization of `nlohmann::basic_json` soon.
specialing basic_json will let us get rid of our `adl_serializer` hacks,
and it'll open the door to better enum serializing behavior without also
forcing all those who use lix as a library to set certain defines (which
may not even be possible depending on how those users use json already).
Change-Id: I5228d2b9df581a189552c993363207cfbd20f445
eldritch horrors
19d7c8352e