add secondary memorial:addr:* field for when the subtag schema is used

data/fields/memorial/addr.json

@@ -1,5 +1,8 @@
 {
     "type": "text",
     "key": "memorial:addr",
-    "label": "Nearest Building Address"
+    "label": "Nearest Building Address",
+    "prerequisiteTag": {
+        "keyNot": "memorial:addr:housenumber"
+    }
 }

data/fields/memorial/addr_subtags.json

@@ -0,0 +1,16 @@
+{
+    "type": "address",
+    "key": "memorial:addr",
+    "keys": [
+        "memorial:addr:city",
+        "memorial:addr:housename",
+        "memorial:addr:housenumber",
+        "memorial:addr:place",
+        "memorial:addr:postcode",
+        "memorial:addr:street"
+    ],
+    "label": "{memorial/addr}",
+    "prerequisiteTag": {
+        "key": "memorial:addr:housenumber"
+    }
+}

data/presets/historic/memorial/stolperstein-EU.json

@@ -7,6 +7,7 @@
     ],
     "moreFields": [
         "memorial/addr",
+        "memorial/addr_subtags",
         "subject/wikidata",
         "image",
         "wikimedia_commons",