[Build] Larger build system update

FIXED: Core now builds under cmake for Windows

TODO: Map and mmap gen currently does not build

TODO: More sync work is required for Eluna, thus Eluna is temporarily disabled

This has only been tested under Windows with CMAKE and VS

src/game/Server/SharedDefines.h

@@ -28,6 +28,11 @@
 #include "Platform/Define.h"
 #include <cassert>
 
+#ifndef MANGOS
+#define MANGOS
+#endif /* MANGOS */
+#define CATA
+
 enum Gender
 {
     GENDER_MALE                        = 0,