[NTOSKRNL]: Add and fix more glue code for EMS/Headless support. The SAC driver is...

[NTOSKRNL]: Add and fix more glue code for EMS/Headless support. The SAC driver is at least correctly able to initialize now when /redirect is enabled.
[SACMSG]: SAC wants the message tables as Unicode, but the CMakeList has an obscure comment that Unicode MC needs "testing". Well, I'll be the first to test it and confirm it works -- implement a UNICODE_SOURCE_REALLY to get Unicode-mc.
[SACMSG]: Add a few more constants.
[SACDRV]: Implement InitializeMachineInformation.
[SACDRV]: Fix countless bugs. Now the entire driver initializes up to UTF8EncodeAndSend, which is unimplemented. We're almost there!

svn path=/trunk/; revision=59718