title: escape HTML by default in Template Toolkit
body: <p>Can I somehow configure Template Toolkit so that:</p>
  
  <pre><code>[% foo %]
  </code></pre>
  
  <p>does what you would now need to say:</p>
  
  <pre><code>[% foo | html %]
  </code></pre>
  
  <p>that is, escape HTML in <code>foo</code>?  And do something else, like:</p>
  
  <pre><code>[% foo | noHtml %]
  </code></pre>
  
  <p>if I <strong>don't</strong> want to escape?</p>