Filter AdaptationSets and Representations with unsupported EssentialProperty elements

Created by: dsilhavy

As defined in ISO/IEC 23009-1

For the element EssentialProperty the Media Presentation author expresses that the successful processing of the descriptor is essential to properly use the information in the parent element that contains this descriptor unless the element shares the same @id with another EssentialProperty element.

dash.js should filter all AdaptationSets and Representations that contain unsupported EssentialProperty elements.