Report on feature support in existing TV specifications

[tidoust]

One useful piece of information for media industries is whether a technology is supported by a particular class of devices, typically those that are compliant with existing TV specifications (ATSC, HbbTV, Hybridcast, CTA WAVE).

To some extent, that information can be automatically asserted by retrieving the TV specification and detecting whether it references the feature in question. Idea would be to add a column that completes the implementation status columns and conveys that information.

Idea raised by @TairT during the Media and Entertainment IG F2F at TPAC.