Support for VAST tag

[hitesh83]

VAST tags are currently used for playing real-time adverts also called programmatic advertising. normally one unique URL per player is provided, it is an XML file that gets updated every time we hit the URL.
in URL there are two main parts, one is an advertisement file like mp4 jpg png, etc.
2nd part is an API to be hit after running the advert successfully.

The advertiser gets paid by a number of API hits.

there are many readymade plugins available for phrasing URLs and doing all these activities.

Some info is available on below link,
https://github.com/minznerjosh/vast-player
https://en.wikipedia.org/wiki/Video_Ad_Serving_Template

See if this can be integrated with Pisignage.