fix: missing includes and forward decls

Author: qudix

include/OBSE/OBSE.h

@@ -2,7 +2,7 @@
 
 #include "OBSE/Impl/PCH.h"
 
-#include "OBSE/Trampoline.h"
 #include "OBSE/API.h"
-#include "OBSE/Version.h"
 #include "OBSE/Interfaces.h"
+#include "OBSE/Trampoline.h"
+#include "OBSE/Version.h"