Some fixes for Windows non-unity builds

Signed-off-by: Esteban Papp <81431996+amznestebanpapp@users.noreply.github.com>

Code/Editor/Util/ColorUtils.cpp

@@ -8,6 +8,7 @@
 
 // Qt
 #include <QColor>
+#include <CryCommon/Cry_Color.h>
 
 //////////////////////////////////////////////////////////////////////////
 QColor ColorLinearToGamma(ColorF col)

Code/Editor/Util/GuidUtil.h

@@ -14,7 +14,12 @@
 #define CRYINCLUDE_EDITOR_UTIL_GUIDUTIL_H
 #pragma once
 
-#include "AzCore/Math/Uuid.h"
+#include <AzCore/Math/Guid.h>
+
+#ifndef _REFGUID_DEFINED
+#define _REFGUID_DEFINED
+typedef const GUID& REFGUID;
+#endif
 
 struct GuidUtil
 {