Part 3 of the ISAPI overhaul. Reframe the 'server conf' into 'dir conf'

  Part 3 of the ISAPI overhaul.  Reframe the 'server conf' into 'dir conf'
  options, creating one single cache of loaded modules [heck, that's what
  it was before.]  This allows finer grained control of specific modules
  that must be 'configured' around to deal with their peculiarities.
  This actually saves much code when we can use global config accessors.

  Grant the module cache it's own pool, and straighen up some other nits.
  No other substantial changes in this pass.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@95073 13f79535-47bb-0310-9956-ffa450edef68