add highchair field to cafe,fast_food,restaurant (#280)

* add highchair field to cafe,fast_food,restaurant

* Update data/fields/highchair.json

Co-authored-by: Martin Raifer <martin@raifer.tech>

* Rename highchair.json to high_chair.json

* Rename high_chair.json to highchair.json

* remove fields which don't do anything for type=check

Co-authored-by: Martin Raifer <martin@raifer.tech>

Author: andrewharvey

data/fields/highchair.json

@@ -0,0 +1,11 @@
+{
+    "key": "highchair",
+    "type": "check",
+    "label": "High Chair",
+    "terms": [
+        "booster",
+        "booster seat",
+        "feeding chair",
+        "kids chair"
+    ]
+}

data/presets/amenity/cafe.json

@@ -32,7 +32,8 @@
         "reservation",
         "smoking",
         "takeaway",
-        "wheelchair"
+        "wheelchair",
+        "highchair"
     ],
     "geometry": [
         "point",

data/presets/amenity/fast_food.json

@@ -32,7 +32,8 @@
         "ref/vatin",
         "smoking",
         "takeaway",
-        "wheelchair"
+        "wheelchair",
+        "highchair"
     ],
     "geometry": [
         "point",

data/presets/amenity/restaurant.json

@@ -35,7 +35,8 @@
         "smoking",
         "stars",
         "takeaway",
-        "wheelchair"
+        "wheelchair",
+        "highchair"
     ],
     "geometry": [
         "point",