title: Handlebar helper for truncating or replacing characters in a string
body: <p>I have a Sendgrid template with a dynamically substituted value (which is a string e.g. {{myValue}}.</p>
  <p>There is a formatDate helper (for date values), but are there any helper classes that would allow me to ensure that the string is output to a maximum number of characters, or to do any string/regex manipulation? I assume I am limited to Sendgrid's built-in helpers?</p>