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/95-choice-per-order-OK.asn1.-Pgen-PER b/tests/tests-asn1c-compiler/95-choice-per-order-OK.asn1.-Pgen-PER
index 8d49825..e3d73f2 100644
--- a/tests/tests-asn1c-compiler/95-choice-per-order-OK.asn1.-Pgen-PER
+++ b/tests/tests-asn1c-compiler/95-choice-per-order-OK.asn1.-Pgen-PER
@@ -114,18 +114,8 @@
 asn_TYPE_descriptor_t asn_DEF_ch_4 = {
 	"ch",
 	"ch",
-	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 */
-	CHOICE_decode_uper,
-	CHOICE_encode_uper,
-	CHOICE_outmost_tag,
 	0,	/* No effective tags (pointer) */
 	0,	/* No effective tags (count) */
 	0,	/* No tags (pointer) */
@@ -204,18 +194,8 @@
 asn_TYPE_descriptor_t asn_DEF_Choice = {
 	"Choice",
 	"Choice",
-	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 */
-	CHOICE_decode_uper,
-	CHOICE_encode_uper,
-	CHOICE_outmost_tag,
 	0,	/* No effective tags (pointer) */
 	0,	/* No effective tags (count) */
 	0,	/* No tags (pointer) */
@@ -310,18 +290,8 @@
 asn_TYPE_descriptor_t asn_DEF_Choice2 = {
 	"Choice2",
 	"Choice2",
-	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 */
-	CHOICE_decode_uper,
-	CHOICE_encode_uper,
-	CHOICE_outmost_tag,
 	0,	/* No effective tags (pointer) */
 	0,	/* No effective tags (count) */
 	0,	/* No tags (pointer) */