Add service data for 'False Destination' and 'Via text'.

Add envelope support for PUBLIC/STAFF enum for display decisions

schemas/api/envelope.json

@@ -10,6 +10,12 @@
             "minimum": 0,
             "description": "Unix timestamp showing when the data was generated, or the time the error was encountered"
         },
+        "p": {
+            "type": "string",
+            "title": "Privilege Type",
+            "description": "Whether the data is public or staff, omitted where no differences",
+            "enum": ["public", "staff"]
+        },
         "d": {
             "description": "Payload data.  Type depends on request endpoint, typically an array of the response type"
         },