Chrimc/utterance (#429)

* Enable template: as a $ref protocol.
Add utterance to mappings.
Simplify stringAsk.

* Enable template: in requires.

* Don't explore schema below $mapping.

* Add threshold for cancel.

* Simplify sandwich.

Author: Chris McConnell

packages/dialog/templates/CancelConfirmation.dialog.lg

@@ -4,6 +4,7 @@
     "$schema": "@{appSchema}",
     "$kind": "Microsoft.OnIntent",
     "intent": "Cancel",
+    "condition": "turn.recognized.score > 0.5",
     "actions": [
         {
             "$kind": "Microsoft.Ask",

packages/dialog/test/commands/dialog/forms/sandwich.schema

@@ -7,10 +7,6 @@
             "minimum": 1,
             "maximum": 10
         },
-        "Directions": {
-            "type": "string",
-            "$comment": "This indicates the whole string is what maps to this."
-        },
         "Length": {
             "type": "number",
             "$mappings": [
@@ -20,6 +16,9 @@
             "$comment": "This is used by the mapping to convert underlying dimensions to inches.",
             "$units": "inches"
         },
+        "Name": {
+            "type": "string"
+        },
         "Bread": {
             "type": "string",
             "enum": [
@@ -55,17 +54,14 @@
                 "none"
             ]
         },
-        "Name": {
-            "type": "string"
-        },
         "Price": {
             "$ref": "template:currency.schema#/currency"
         }
     },
     "required": [
         "Name",
-        "Meat",
         "Bread",
+        "Meat",
         "Cheese"
     ],
     "$requires": [