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/sa/ike_sa_id.h

@@ -25,6 +25,8 @@
 #ifndef IKE_SA_ID_H_
 #define IKE_SA_ID_H_
 
+typedef struct ike_sa_id_t ike_sa_id_t;
+
 #include <types.h>
 
 /**
@@ -32,8 +34,6 @@
  */
 #define IKE_SA_ID_PRINTF_SPEC 'J'
 
-typedef struct ike_sa_id_t ike_sa_id_t;
-
 /**
  * @brief An object of type ike_sa_id_t is used to identify an IKE_SA.
  *