Add support for junction=circular (same as junction=roundabout)

(closes #4637)

data/presets.yaml

@@ -2625,6 +2625,9 @@ en:
         name: Camp Pitch
         # 'terms: tent,rv'
         terms: '<translate with synonyms or related terms for ''Camp Pitch'', separated by commas>'
+      circular:
+        # junction=circular
+        name: Traffic Circle
       club:
         # club=*
         name: Club

data/presets/presets.json

@@ -52,6 +52,20 @@
             "searchable": false,
             "name": "Amenity"
         },
+        "circular": {
+            "geometry": [
+                "vertex",
+                "line"
+            ],
+            "fields": [
+                "name"
+            ],
+            "tags": {
+                "junction": "circular"
+            },
+            "name": "Traffic Circle",
+            "searchable": false
+        },
         "highway": {
             "fields": [
                 "name",

data/presets/presets/_circular.json

@@ -0,0 +1,14 @@
+{
+    "geometry": [
+        "vertex",
+        "line"
+    ],
+    "fields": [
+        "name"
+    ],
+    "tags": {
+        "junction": "circular"
+    },
+    "name": "Traffic Circle",
+    "searchable": false
+}

data/taginfo.json

@@ -21,6 +21,10 @@
         {
             "key": "amenity"
         },
+        {
+            "key": "junction",
+            "value": "circular"
+        },
         {
             "key": "highway"
         },