Remove global Windows.h include

This is the beginning of efforts to reduce the scope of Windows.h. I have
shuttled it into hsWindows.h (again) and fixed the compilation of the
major apps. There is still some scope work that needs to be done, and the
Max plugin has not yet been addressed.

Sources/Plasma/PubUtilLib/plAudio/plEAXEffects.h

@@ -65,8 +65,10 @@ typedef struct _EAXREVERBPROPERTIES EAXREVERBPROPERTIES;
 #include "plEAXStructures.h"
 #endif
 
-#if !HS_BUILD_FOR_WIN32
-#define GUID char*
+#if HS_BUILD_FOR_WIN32
+    typedef struct _GUID GUID;
+#else
+#    define GUID char*
 #endif
 
 class plEAXListener 

Sources/Plasma/PubUtilLib/plAudio/plWinMicLevel.cpp

@@ -57,6 +57,7 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 
 
 #if HS_BUILD_FOR_WIN32
+#include "hsWindows.h"
 #include <mmsystem.h>