Show Advisory Speed Limit by default on link presets in Canada, U.S.

Canada and the United States generally post only an advisory speed limit and avoid posting a legal speed limit on highway ramps. Other countries differ. This change splits the maxspeed field into two as a workaround for the inability to limit the default inclusion of a field to a particular location set.

data/fields/maxspeed.json

@@ -2,5 +2,8 @@
     "key": "maxspeed",
     "type": "roadspeed",
     "label": "Speed Limit",
-    "placeholder": "40, 50, 60..."
+    "placeholder": "40, 50, 60...",
+    "locationSet": {
+        "exclude": ["ca", "us"]
+    }
 }

data/fields/maxspeed/advisory.json

@@ -2,5 +2,8 @@
     "key": "maxspeed:advisory",
     "type": "roadspeed",
     "label": "Advisory Speed Limit",
-    "placeholder": "40, 50, 60..."
+    "placeholder": "40, 50, 60...",
+    "locationSet": {
+        "include": ["ca", "us"]
+    }
 }

data/fields/maxspeed/advisory_mutcd.json

@@ -0,0 +1,9 @@
+{
+    "key": "maxspeed:advisory",
+    "type": "roadspeed",
+    "label": "Advisory Speed Limit",
+    "placeholder": "40, 50, 60...",
+    "locationSet": {
+        "exclude": ["ca", "us"]
+    }
+}

data/fields/maxspeed_mutcd.json

@@ -0,0 +1,9 @@
+{
+    "key": "maxspeed",
+    "type": "roadspeed",
+    "label": "Speed Limit",
+    "placeholder": "40, 50, 60...",
+    "locationSet": {
+        "include": ["ca", "us"]
+    }
+}