Move type operations to another structure

Every type has free, print, check_constraints, ber_decoder, der_encoder,
xer_decoder, xer_encoder, uper_decoder, uper_encoder and outmost_tag
operations. We move them out to a separate structure asn_TYPE_operation_t.

Combined with previous logic simplification, these operations are based
on ASN.1 basic types, constructed types and string types. So we can
reduce the space occupied by asn_TYPE_descriptor_t variables.
diff --git a/tests/tests-asn1c-compiler/94-set-optionals-OK.asn1.-P b/tests/tests-asn1c-compiler/94-set-optionals-OK.asn1.-P
index fd3574b..21a28ef 100644
--- a/tests/tests-asn1c-compiler/94-set-optionals-OK.asn1.-P
+++ b/tests/tests-asn1c-compiler/94-set-optionals-OK.asn1.-P
@@ -201,17 +201,8 @@
 asn_TYPE_descriptor_t asn_DEF_TestSet = {
 	"TestSet",
 	"TestSet",
-	SET_free,
-	SET_print,
-	SET_compare,
+	&asn_OP_SET,
 	SET_constraint,
-	SET_decode_ber,
-	SET_encode_der,
-	SET_decode_xer,
-	SET_encode_xer,
-	0, 0,	/* No OER support, use "-gen-OER" to enable */
-	0, 0,	/* No PER support, use "-gen-PER" to enable */
-	0,	/* Use generic outmost tag fetcher */
 	asn_DEF_TestSet_tags_1,
 	sizeof(asn_DEF_TestSet_tags_1)
 		/sizeof(asn_DEF_TestSet_tags_1[0]), /* 1 */