Add frame content details to D-Star debug logging

[timclassic]

Commit bf5651b deleted all log entries related to D-Star frame contents. This change adds some detail to the existing D-Star frame debugging log entries. Rather than always printing "audio", frames may be logged as one of "audio", "nullaudio", or "fastdata".

A minimum width has been set for some fields so that the log messages form columns while watching a data stream.

By virtue of centralizing the frame log messages, this commit also adds debugging entries for frames originating from the network.

Example log entries that contain all three types as generated by a Kenwood TH-D74 using fast data:

  M: 2021-01-01 19:52:44.255 D-Star, received RF header from KG4BXH  /D74  to CQCQCQ
  D: 2021-01-01 19:52:44.282 D-Star, RF nullaudio sequence no.  0
  D: 2021-01-01 19:52:44.282 D-Star, RF nullaudio sequence no.  1
  D: 2021-01-01 19:52:44.309 D-Star, RF nullaudio sequence no.  2
  D: 2021-01-01 19:52:44.332 D-Star, RF nullaudio sequence no.  3
  D: 2021-01-01 19:52:44.354 D-Star, RF nullaudio sequence no.  4
  D: 2021-01-01 19:52:44.365 D-Star, RF nullaudio sequence no.  5
  D: 2021-01-01 19:52:44.388 D-Star, RF nullaudio sequence no.  6
  D: 2021-01-01 19:52:44.404 D-Star, RF nullaudio sequence no.  7
  D: 2021-01-01 19:52:44.426 D-Star, RF nullaudio sequence no.  8
  D: 2021-01-01 19:52:44.443 D-Star, RF nullaudio sequence no.  9
  D: 2021-01-01 19:52:44.465 D-Star, RF nullaudio sequence no. 10
  D: 2021-01-01 19:52:44.488 D-Star, RF nullaudio sequence no. 11
  D: 2021-01-01 19:52:44.510 D-Star, RF nullaudio sequence no. 12
  D: 2021-01-01 19:52:44.526 D-Star, RF nullaudio sequence no. 13
  D: 2021-01-01 19:52:44.543 D-Star, RF nullaudio sequence no. 14
  D: 2021-01-01 19:52:44.565 D-Star, RF nullaudio sequence no. 15
  D: 2021-01-01 19:52:44.588 D-Star, RF nullaudio sequence no. 16
  D: 2021-01-01 19:52:44.604 D-Star, RF nullaudio sequence no. 17
  D: 2021-01-01 19:52:44.627 D-Star, RF nullaudio sequence no. 18
  D: 2021-01-01 19:52:44.649 D-Star, RF nullaudio sequence no. 19
  D: 2021-01-01 19:52:44.665 D-Star, RF nullaudio sequence no. 20
  D: 2021-01-01 19:52:44.704 D-Star, RF fastdata  sequence no.  0
  D: 2021-01-01 19:52:44.704 D-Star, RF fastdata  sequence no.  1
  D: 2021-01-01 19:52:44.726 D-Star, RF fastdata  sequence no.  2
  D: 2021-01-01 19:52:44.748 D-Star, RF fastdata  sequence no.  3
  D: 2021-01-01 19:52:44.765 D-Star, RF fastdata  sequence no.  4
   ... many fastdata frames elided ...
  D: 2021-01-01 19:52:45.486 D-Star, RF fastdata  sequence no. 19
  D: 2021-01-01 19:52:45.508 D-Star, RF fastdata  sequence no. 20
  D: 2021-01-01 19:52:45.548 D-Star, RF fastdata  sequence no.  0
  D: 2021-01-01 19:52:45.548 D-Star, RF fastdata  sequence no.  1
  D: 2021-01-01 19:52:45.565 D-Star, RF fastdata  sequence no.  2
  D: 2021-01-01 19:52:45.587 D-Star, RF audio     sequence no.  3, errs:  0/48 (  0.0%)
  D: 2021-01-01 19:52:45.609 D-Star, RF audio     sequence no.  4, errs:  0/48 (  0.0%)
  D: 2021-01-01 19:52:45.631 D-Star, RF audio     sequence no.  5, errs:  0/48 (  0.0%)
  D: 2021-01-01 19:52:45.648 D-Star, RF audio     sequence no.  6, errs:  0/48 (  0.0%)
  D: 2021-01-01 19:52:45.670 D-Star, RF audio     sequence no.  7, errs:  0/48 (  0.0%)
  D: 2021-01-01 19:52:45.687 D-Star, RF audio     sequence no.  8, errs:  0/48 (  0.0%)
  D: 2021-01-01 19:52:45.709 D-Star, RF fastdata  sequence no.  9
  D: 2021-01-01 19:52:45.731 D-Star, RF fastdata  sequence no. 10
  D: 2021-01-01 19:52:45.753 D-Star, RF fastdata  sequence no. 11
  D: 2021-01-01 19:52:45.775 D-Star, RF fastdata  sequence no. 12
  D: 2021-01-01 19:52:45.786 D-Star, RF fastdata  sequence no. 13
   ... many more fastdata frames with periodic audio as above ...