Another day's progress... little changes, but just establishing the

  Another day's progress... little changes, but just establishing the
  baseline for fully implementing extensions.  Filters... that's still
  a little way away.  This demonstrates the HSE_STATUS_PENDING result
  wait event trap, so we let another thread keep working till we get
  the HSE_REQ_DONE_WITH_SESSION request.  Cleaned up callback names
  and tossed bunches of stuff in the isapi_cid (connection/request) and
  the isapi_loaded (dll details) for future caching optimizations.

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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85903 13f79535-47bb-0310-9956-ffa450edef68