Replace maki-ice_cream icon with better fas-ice_cream icon

Also add an unsearchable fast_food/_ice_cream preset
This is for brands like Dairy Queen and Freddy's.
fast_food place with ice cream focus, but also burgers, fries, etc.

The preset is unsearchable because we prefer for users to use the
amenity/ice_cream preset for tagging normal ice cream shops.

data/presets/presets/amenity/fast_food/_ice_cream.json

@@ -0,0 +1,17 @@
+{
+    "icon": "fas-ice-cream",
+    "geometry": [
+        "point",
+        "area"
+    ],
+    "tags": {
+        "amenity": "fast_food",
+        "cuisine": "ice_cream"
+    },
+    "reference": {
+        "key": "cuisine",
+        "value": "ice_cream"
+    },
+    "name": "Ice Cream Fast Food",
+    "searchable": false
+}

data/presets/presets/amenity/ice_cream.json

@@ -1,5 +1,5 @@
 {
-    "icon": "maki-ice-cream",
+    "icon": "fas-ice-cream",
     "fields": [
         "name",
         "address",

svg/fontawesome/fas-ice-cream.svg

@@ -0,0 +1 @@
+<svg aria-hidden="true" focusable="false" data-prefix="fas" data-icon="ice-cream" class="svg-inline--fa fa-ice-cream fa-w-14" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><path fill="currentColor" d="M368 160h-.94a144 144 0 1 0-286.12 0H80a48 48 0 0 0 0 96h288a48 48 0 0 0 0-96zM195.38 493.69a31.52 31.52 0 0 0 57.24 0L352 288H96z"></path></svg>