code: @Transformer(requireTemplate = true)
      public static RawData escape(Object o) {
          return escape(null, o);
      }
docs: Return a {@link org.rythmengine.utils.RawData} type wrapper of
  an object without escaping or if the current template exists
  return the escape specified by the current escape scheme of the current
  render template
  <p/>
  <p>Object is {@link #toString(Object) converted to String} before escaping</p>
  
  @param o
  @return escaped data