Feature capabilities filter

[dsilhavy]

This addresses issues #3510 and #3509

• Adds CapabilitiesFilter that filters Representations and Adaptations for each period(stream object)
  • Removes unsupported AS and Rep based on media codec
  • Removes unsupported AS and Rep based on EssentialProperty
• Can be disabled via Settings flag

The reason to add a new class here is to have a single point where all the necessary filtering is performed, prior to the initialization of the StreamProcessors. Additional filters might be added in the future