add (hidden) preset for crossing=uncontrolled, closes #390

this allows to render both of the two synonymous tags `crossing=marked` and `crossing=uncontrolled`

data/presets/highway/crossing/_uncontrolled.json

@@ -0,0 +1,22 @@
+{
+    "icon": "temaki-pedestrian_crosswalk",
+    "fields": [
+        "crossing",
+        "tactile_paving",
+        "crossing/island",
+        "crossing_raised"
+    ],
+    "geometry": [
+        "vertex"
+    ],
+    "tags": {
+        "highway": "crossing",
+        "crossing": "uncontrolled"
+    },
+    "reference": {
+        "key": "crossing",
+        "value": "uncontrolled"
+    },
+    "name": "Marked Crosswalk",
+    "searchable": false
+}

data/presets/highway/crossing/marked.json

@@ -14,8 +14,8 @@
         "crossing": "marked"
     },
     "reference": {
-        "key": "highway",
-        "value": "crossing"
+        "key": "crossing",
+        "value": "marked"
     },
     "terms": [
         "zebra crossing",

data/presets/highway/cycleway/crossing/marked.json

@@ -16,8 +16,8 @@
         "crossing": "marked"
     },
     "reference": {
-        "key": "cycleway",
-        "value": "crossing"
+        "key": "crossing",
+        "value": "marked"
     },
     "terms": [
         "cycle crosswalk",

data/presets/highway/cycleway/crossing/unmarked.json

@@ -16,8 +16,8 @@
         "crossing": "unmarked"
     },
     "reference": {
-        "key": "cycleway",
-        "value": "crossing"
+        "key": "crossing",
+        "value": "unmarked"
     },
     "terms": [
         "cycle path crossing",