(svn r2639) -Add: Added the vehicle names in table/engines.h so that you know what line represents what vehicle (I hope I didn't mess that up). Added some comments while I'm at it and include the table/ directory in the Doxygen generation

#ifndef CALLBACK_TABLE_H
#define CALLBACK_TABLE_H

extern CommandCallback *_callback_table[];
extern const int _callback_table_count;

#endif