Radical overhaul of the Apache-2.0/Win32 mpm <-> service schema.

  1) Services and Registry are not part of the core Apache operations,
     so registry.c and service.c are moved into Apache.exe - assuring
     the service control layers of NT and 95 are truly isolated.

  2) Isolation can't be complete, we need to know when the mpm is
     fully initialized.  A new pointer to a no-arg function returning
     void is provided for this purpose, ap_mpm_init_complete.  It is
     only called if overridden with a non-NULL value prior to invoking
     apache_main.

  3) Control+C, Control+Break are handled on both WinNT and Win9x.

  4) The window close, logoff and shutdown events are handled on WinNT.

  5) The beginnings of a Win95 service startup are provided, -k startservice
     but this is horribly incomplete since Win95 will NOT report shutdown.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85235 13f79535-47bb-0310-9956-ffa450edef68