Support oneOf syntax in BooleanField with radio widget.

[JamesGuthrie]

Prerequisites

• I have read the documentation;
• In the case of a bug report, I understand that providing a SSCCE example is tremendously useful to the maintainers.

Description

Recently support for the oneOf syntax was added for enums, it can be used to replace the existing enum/enumNames syntax which does not conform to the json schema spec.

Steps to Reproduce

json schema

{
  "title": "An example of bad behaviour",
  "type": "object",
  "properties": {
    "test": {
      "type": "boolean",
      "oneOf": [
        {
          "const": true,
          "title": "True"
        },
        {
          "const": false,
          "title": "False"
        }
      ]
    }
  }
}

UI schema:

{
  "test": {
    "ui:widget": "radio"
  }
}

I've set up a sample JSFiddle demonstrating the issue.

Expected behavior

The title values in the oneOf objects are used for titles of the radios

Actual behavior

The titles of the radios are yes/no

Version

v1.0.3