Replace the Order/orderLines type

The `orderLines` type in the schema was incorrectly set to be `RefundLinesType`
which meant that many of the values were not exposed to the user.

Fixes highsidelabs#13, fixes highsidelabs#17, fixes highsidelabs#19

resources/schemas/modifications/replacements.json

@@ -42,6 +42,19 @@
           }
         },
         "schemas": {}
+      },
+      "orders": {
+        "components": {
+          "schemas": {
+            "Order": {
+              "properties": {
+                "orderLines": {
+                  "$ref": "#\/components\/schemas\/OrderLinesType"
+                }
+              }
+            }
+          }
+        }
       }
     }
   }