Feature Request: support CiviCRM Email Templates for email handlers

1.0 Problem/Motivation

The email handler configuration, while featureful, is somewhat clunky.
I would appreciate being able to choose an exististing CiviMail template for responses,
and to be able to embed as a token in the template, the data collected on the webform.

2.0 Detailed steps to reproduce (embed screenshots)

3.0 Proposed resolution

As a site administrator, when configuring an email handler for a CiviCRM integrated webform, I would like to mark a checkbox, which will expose a selector, allowing me to choose among existing CiviMail templates to be used by the email handler.

As a site administrator, when configuring a CiviMail template, I would like to be able to access a token, which will embed in the template the data collected on a CiviCRM integrated webform.