- Removed the PES_STRIPPED flag. It's unnecessary. We can strip
PES in the TS extractor instead.
- Made nearly all of the object classes in DvbParser immutable.
Else it's non-obvious that none of this state can be mutated.
- Made a a lot of the methods in DvbParser static for the same
reason.
- Removed unnecessary null checks, code that was never executed,
unused fields etc.
- Add proper flushing of DvbParser, to prevent corrupt output
following a seek.
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