AAC common: implement ADTS-to-raw parser & framing packet converter

This is groundwork for adding a LOAS/LATM parser on top of it.
MPEG TS: use AAC parser/framing packet converter
MPEG TS: only treat »missing PMT tag altogether« as AC3, not on »unknown PMT tag«

Case in point: HEVC uses a PMT tag that's unknown to mkvmerge. Before
this commit mkvmerge would treat it as AC3 and try to probe it as that
which takes a lot of time.
codec_c: provide track type as well
MPEG TS: parse PMT registration descriptor and get codec from it
MPEG TS: improve debug output for unknown tracks in the PMT
tests: add SimpleTest#test_info method
tests: add test for mkvinfo's various output modes
mkvinfo: round timecodes to ms instead of cutting them off

Fixes #1093.