MEDIUM: debug: add a new version of complain() that takes a debug_count struct

MEDIUM: debug: add a new version of complain() that takes a debug_count struct

complain_with_dbg() takes a debug_count struct in argument from which
it retrieves everything it needs:
  - details
  - type
  - file name
  - line number
  - description
  - vaargs

This is done by making the common _complain() able to decode such elements
from a debug_count when presented. complain() passes a NULL there and uses
its msg, while complain_with_dbg() passes the debug_count and no msg. This
allows us to get rid of all the pre-made redundant messages and to save
70 kB of code. We're now around 136 kB under the initial size.