Actually ue typedefs for obj_data, char_data and descriptor_data.

Some linting in a couple of files. Massive commit...

src/mail.h

@@ -41,7 +41,7 @@ int scan_file(void);
 int has_mail(long recipient);
 void store_mail(long to, long from, char *message_pointer);
 char *read_delete(long recipient);
-void    notify_if_playing(struct char_data *from, int recipient_id);
+void    notify_if_playing(char_data *from, int recipient_id);
 
 struct mail_t {
     long recipient;