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"
         },

schemas/api/stations/board.json

@@ -111,6 +111,29 @@
                     "title": "Headcode",
                     "description": "The headcode of the service"
                 },
+                "fd": {
+                    "type": "object",
+                    "title": "False Destination",
+                    "description": "False destination should be preferred on public boards",
+                    "required": ["t", "n"],
+                    "properties": {
+                        "t": {
+                            "type": "string",
+                            "title": "TIPLOC",
+                            "description": "The Destination TIPLOC"
+                        },
+                        "n": {
+                            "type": "string",
+                            "title": "Name",
+                            "description": "The Destination Name"
+                        }
+                    }
+                },
+                "v": {
+                    "type": "string",
+                    "title": "via Text",
+                    "description": "via text that should be displayed if present"
+                },
                 "sta": {
                     "type": "string",
                     "format": "date-time",