Clean up includes in the "classes" folder

- Canonicalized the header guards
- Removed all the sneaky dependencies between files
- Made sure includes were properly sorted

osx/classes/regtown.h

@@ -6,11 +6,16 @@
  *
  */
 
-#ifndef REGTOWN_H
-#define REGTOWN_H
+#ifndef BOE_DATA_REGTOWN_H
+#define BOE_DATA_REGTOWN_H
 
 #include <iosfwd>
 
+#include "town.h"
+#include "simpletypes.h"
+#include "location.h"
+#include "monster.h"
+
 namespace legacy {
 	struct big_tr_type;
 	struct ave_tr_type;