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/22-tags-OK.asn1.-Pfwide-types b/tests/tests-asn1c-compiler/22-tags-OK.asn1.-Pfwide-types
index ccc8c75..dd33adb 100644
--- a/tests/tests-asn1c-compiler/22-tags-OK.asn1.-Pfwide-types
+++ b/tests/tests-asn1c-compiler/22-tags-OK.asn1.-Pfwide-types
@@ -83,17 +83,8 @@
 asn_TYPE_descriptor_t asn_DEF_b_3 = {
 	"b",
 	"b",
-	CHOICE_free,
-	CHOICE_print,
-	CHOICE_compare,
+	&asn_OP_CHOICE,
 	CHOICE_constraint,
-	CHOICE_decode_ber,
-	CHOICE_encode_der,
-	CHOICE_decode_xer,
-	CHOICE_encode_xer,
-	0, 0,	/* No OER support, use "-gen-OER" to enable */
-	0, 0,	/* No PER support, use "-gen-PER" to enable */
-	CHOICE_outmost_tag,
 	0,	/* No effective tags (pointer) */
 	0,	/* No effective tags (count) */
 	0,	/* No tags (pointer) */
@@ -160,17 +151,8 @@
 asn_TYPE_descriptor_t asn_DEF_T1 = {
 	"T1",
 	"T1",
-	SEQUENCE_free,
-	SEQUENCE_print,
-	SEQUENCE_compare,
+	&asn_OP_SEQUENCE,
 	SEQUENCE_constraint,
-	SEQUENCE_decode_ber,
-	SEQUENCE_encode_der,
-	SEQUENCE_decode_xer,
-	SEQUENCE_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_T1_tags_1,
 	sizeof(asn_DEF_T1_tags_1)
 		/sizeof(asn_DEF_T1_tags_1[0]), /* 1 */