Support EMSG events during DASH playbacks

[ChernyshovYuriy]

Hi,
In one of the closed issue (#1414) you mentioned that:

For DASH and SmoothStreaming custom data can be embedded directly into the media in 
EMSG boxes, which we'll be adding support for in 2.x.

Is there any updates on this case so far for the version 2.0.4?

[ojw28]

This is not supported yet. Let's use this issue to track the enhancement.

[ChernyshovYuriy]

Thanks for feedback!
Can you spot a class to start investigate from?
Perhaps, if you have not enough resources for this issue, I can start to implement and submit pull request later?