jeh993

This adds formatted output for "cueIn" and "cueOut" for use with Doubleclick's DAI. https://support.google.com/dfp_premium/answer/7245661?hl=en&ref_topic=7335768

This adds attributes needed for Doubleclick's dynamic ad insertion (DAI). https://support.google.com/dfp_premium/answer/7245661?hl=en&ref_topic=7335768

Currently, the content returned by ON_GET_DATA event is the same as the message. This change returns the actual content of the response from Caspar