(svn r2962) - const correctness for all Get* functions and most Draw* functions that don't change their pointer parameters

- change a lot of byte player types to PlayerID
- beautify header files, same "#endif /* filename */" ending

network_data.h

@@ -231,4 +231,4 @@ unsigned long NetworkResolveHost(const char *hostname);
 
 #endif /* ENABLE_NETWORK */
 
-#endif // NETWORK_DATA_H
+#endif /* NETWORK_DATA_H */