Make metadata with attribute_type attribute_value keys display correctly

[casey]

For reasons not known to me, lots of inscriptions use NFTs where attributes are stored as a list of objects that looks like:

            "attributes": [
                {
                    "trait_type": "Clan",
                    "value": "Aoi"
                },
                {
                    "trait_type": "Class",
                    "value": "Warrior"
                }
            ]

We should make these display correctly. I'm not sure the best way to do this, but I think it would be pretty reasonable to scan deserialized metadata for lists that contain objects whose top level keys are trait_type and value and replace these with simple dictionaries mapping the trait name to the value, as god intended.