Mark padding bytes in the dissector output
Mark initial header bytes in dissector output
Mark more unknown protocol pieces
Align coding style with other dissector functions
Keep all activity name bytes and `0` terminate it everywhere
Sync dissector with `libambit` implementation

This makes a few previously unknown bytes known.  The order of the personal
unit and coordinate system related declarations has been changed to match
their order in the packet for easier comparison.
Add boot strap loader (BSL) version to the dissector