Intrusive bus diagnostics

[Rahix]

The stack should recover from errors of all kind by itself, but it should keep track of things going wrong so a diagnostics report can be emitted by a system using profirust.

• On FDL level:
  • Token Lost
  • Token Retries (Depends on FDL master must check if token was received #8)
• On DP level, tracked separately for each peripheral:
  • Telegrams without a response
  • Telegrams with a faulty response (UART framing, checksum, wrong telegram)