Cleanup: Remove more traces of old squid debug()() macro

Cleanup: Remove more traces of old squid debug()() macro

There is now no reason for any of the Squid internal code to contain 'debug()'

TODO: Just the ESI code remaining on the old system.
  It's debug seems to be incrementally building a single line to display
  objects parsed. But using multiple nested calls to dump it.
  VERY nasty. They need to be made writing to a buffer instead.