Handle stream that starts with junk data. Report ignored packets/data

[SoylentGraham]

If someone is using this library to decode data, and pass half-good data, the library should at least still try and get something out of it.
If someone passes in a stream, but with junk/bad headers at the start, but with H264/Jpeg/HEVC data, we should still get it out.

• Start reporting blocks of pushed data/packets that we walked over because we couldn't determine the type
• Report packets we dropped
  • SEI packets on apple are ignored
  • IDRframes etc, that are dropped because we don't have SPS,PPS etc beforehand
• Report dropped/ignored packets as frames in peek/pop