add "generic" format string based encoder and decoder (scan_asn1generic,

fmt_asn1generic, see t10.c for example usage)
add "generic" asn.1 dumper (in t10.c)
fix some read off-by-one errors, minor cleanups
add real OID support
add bitstring support

ldapclient_str.c

@@ -3,7 +3,6 @@
 #include <string.h>
 #include "byte.h"
 #include "buffer.h"
-#include "asn1.h"
 #include "ldap.h"
 #include "socket.h"
 #include "ip4.h"