moved typedefs to beginning of files to solve some include problems

splitted authenticator to have a separate implementation for each auth_method_t
using va_copy to clone va_lists, should fix proplems on AMD64
some other cleanups

src/charon/threads/sender.h

@@ -24,10 +24,10 @@
 #ifndef SENDER_H_
 #define SENDER_H_
 
-#include <types.h>
-
 typedef struct sender_t sender_t;
 
+#include <types.h>
+
 /**
  * @brief Thread responsible for sending packets over the socket.
  *