UK specific Post Box tagging. (#804)

adding fields for tags: post_box:type and royal_cypher

data/fields/post_box/type.json

@@ -0,0 +1,14 @@
+{
+    "key": "post_box:type",
+    "type": "typeCombo",
+    "label": "Type",
+    "strings": {
+        "options": {
+            "pillar": "Pillar",
+            "lamp": "Lamp",
+            "wall": "Wall"
+        }
+    },
+    "autoSuggestions": false,
+    "customValues": false
+}

data/fields/royal_cypher.json

@@ -0,0 +1,20 @@
+{
+    "key": "royal_cypher",
+    "type": "typeCombo",
+    "label": "Royal Cypher",
+    "strings": {
+        "options": {
+            "VR": "VR (Victoria)",
+            "EVIIR": "EVIIR (Edward VII)",
+            "EVIIIR": "EVIIIR (Edward VIII)",
+            "GR": "GR (George V)",
+            "GVIR": "GVIR (George VI)",
+            "EIIR": "EIIR (Elizabeth II)",
+            "CIIIR": "CIIIR (Charles III)",
+            "scottish_crown": "Scottish Crown",
+            "no": "No"
+        }
+    },
+    "autoSuggestions": false,
+    "customValues": false
+}