Various mpeg-ts fixes
tsparse: Don't use non-object for debugging statement
Use the pad instead
Some descriptors can only be present in some section
examples/ts-parser: Try more descriptor/stream types
These were added recently
mpegts: Don't add non-padded streams to collection on updates
When carrying over existing GstStream to a new GstStreamCollection we need to
check whether they *actually* were being used in the previous collection.
This avoids adding unknown streams (metadata, PSI, etc...) to the collection on
updates.