Add support for text param for Inset text

[frankieroberto]

This adds support for a text param for the Inset text component, for use where only a single paragraph is included. Resolves #1108

This means that instead of:

{{ insetText({
  html: "<p>This is a note.</p>"
}) }}

you can do this:

{{ insetText({
  text: "This is a note."
}) }}

When the text param is used, the text is enclosed by paragraph tags.

Checklist

• Tested against our testing policy (Resolution, Browser & Accessibility)
• Follows our coding standards and style guide
• CHANGELOG entry

[colinrotherham]

Hadn't realised the approval was cleared

If you've double checked indent(2) was correct I'm happy!