mod_http_oauth2: Allow omitting application type for native apps This derives "application_type":"native" from the first redirect URI when registering a client, so that it can be omitted without the default value of "web" causing the very same redirect URIs to be rejected.

<tr>
  <th>What is {x} {op} {y}?</th><td>
    <input name="captcha_challenge" type="hidden" value="{challenge}">
    <input name="captcha_reply" pattern="[0-9]+" required type="number">
  </td></tr>