Track more than just port in the run loop.

[oubiwann]

• [x] Create a new record definition with the following fields:
  • filename
  • options
  • fd
  • port
• [x] Update the loop to pass the record around (instead of just the port)
• [x] Update all the loop functions to use the record macros to extract the required data
• [x] Add API functions for
  • getting the state, and
  • getting the data for each field in the current state record

[oubiwann]

Merged in this commit:

• fb756a6966533d902b1517c58f9e37caf629b90b