Improve support for KLV metadata in tsdemuxer and tsmuxer

Submitted by Michael Fien

Link to original bug (#791533)

Description

Created attachment 365454
Mpeg2 transport stream descriptor for KLV

Add additions to tsdemuxer and tsmuxer that handle synchronous and asynchronous metadata streams per MISB-0604

Patch 365454, "Mpeg2 transport stream descriptor for KLV":
0001-Add-MPEG2-TS-descriptor-support-for-KLV-metadata.patch

Version: 1.12.0