Keep the colleague's microbu-esp32c5 tree in this repository

obu-firmware builds against vanetza-idf from microbu-esp32c5/external, but
that tree was gitignored, so a clone of this repository could not build the
firmware it ships. It is now committed here as ordinary files in its own
folder, microbu-esp32c5/: the colleague's commit cf4b99f plus the V2X2MAP
bridge's signature verification (--trust) used on the bench. Nothing is
fetched from or pushed to the colleague's repository; this repository and
its remotes carry everything. The folder's own .gitignore keeps build output,
downloaded components and private key material out, as it did there; the
committed file set is identical to that repository's tracked files.

The ESP32-C5 is still flashed from obu-firmware/, which only takes
vanetza-idf from microbu-esp32c5/, so the two stay separate folders.
FLASHING.md says how to take a newer version of the colleague's tree (copy
it over the folder, rebuild, test, commit).

microbu-esp32c5/external/vanetza-idf/vanetza/asn1/its/SegmentAttributeXY.h

@@ -0,0 +1,94 @@
+/*
+ * Generated by asn1c
+ * From ASN.1 module "DSRC"
+ * 	found in "ISO19091.asn"
+ * 	`asn1c -fcompound-names -fincludes-quoted -no-gen-example -R`
+ */
+
+#ifndef	_SegmentAttributeXY_H_
+#define	_SegmentAttributeXY_H_
+
+
+#include "asn_application.h"
+
+/* Including external dependencies */
+#include "NativeEnumerated.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Dependencies */
+typedef enum SegmentAttributeXY {
+	SegmentAttributeXY_reserved	= 0,
+	SegmentAttributeXY_doNotBlock	= 1,
+	SegmentAttributeXY_whiteLine	= 2,
+	SegmentAttributeXY_mergingLaneLeft	= 3,
+	SegmentAttributeXY_mergingLaneRight	= 4,
+	SegmentAttributeXY_curbOnLeft	= 5,
+	SegmentAttributeXY_curbOnRight	= 6,
+	SegmentAttributeXY_loadingzoneOnLeft	= 7,
+	SegmentAttributeXY_loadingzoneOnRight	= 8,
+	SegmentAttributeXY_turnOutPointOnLeft	= 9,
+	SegmentAttributeXY_turnOutPointOnRight	= 10,
+	SegmentAttributeXY_adjacentParkingOnLeft	= 11,
+	SegmentAttributeXY_adjacentParkingOnRight	= 12,
+	SegmentAttributeXY_adjacentBikeLaneOnLeft	= 13,
+	SegmentAttributeXY_adjacentBikeLaneOnRight	= 14,
+	SegmentAttributeXY_sharedBikeLane	= 15,
+	SegmentAttributeXY_bikeBoxInFront	= 16,
+	SegmentAttributeXY_transitStopOnLeft	= 17,
+	SegmentAttributeXY_transitStopOnRight	= 18,
+	SegmentAttributeXY_transitStopInLane	= 19,
+	SegmentAttributeXY_sharedWithTrackedVehicle	= 20,
+	SegmentAttributeXY_safeIsland	= 21,
+	SegmentAttributeXY_lowCurbsPresent	= 22,
+	SegmentAttributeXY_rumbleStripPresent	= 23,
+	SegmentAttributeXY_audibleSignalingPresent	= 24,
+	SegmentAttributeXY_adaptiveTimingPresent	= 25,
+	SegmentAttributeXY_rfSignalRequestPresent	= 26,
+	SegmentAttributeXY_partialCurbIntrusion	= 27,
+	SegmentAttributeXY_taperToLeft	= 28,
+	SegmentAttributeXY_taperToRight	= 29,
+	SegmentAttributeXY_taperToCenterLine	= 30,
+	SegmentAttributeXY_parallelParking	= 31,
+	SegmentAttributeXY_headInParking	= 32,
+	SegmentAttributeXY_freeParking	= 33,
+	SegmentAttributeXY_timeRestrictionsOnParking	= 34,
+	SegmentAttributeXY_costToPark	= 35,
+	SegmentAttributeXY_midBlockCurbPresent	= 36,
+	SegmentAttributeXY_unEvenPavementPresent	= 37
+	/*
+	 * Enumeration is extensible
+	 */
+} e_SegmentAttributeXY;
+
+/* SegmentAttributeXY */
+typedef long	 SegmentAttributeXY_t;
+
+/* Implementation */
+extern asn_oer_constraints_t asn_OER_type_SegmentAttributeXY_constr_1;
+extern asn_per_constraints_t asn_PER_type_SegmentAttributeXY_constr_1;
+extern asn_TYPE_descriptor_t asn_DEF_SegmentAttributeXY;
+extern const asn_INTEGER_specifics_t asn_SPC_SegmentAttributeXY_specs_1;
+asn_struct_free_f SegmentAttributeXY_free;
+asn_struct_print_f SegmentAttributeXY_print;
+asn_constr_check_f SegmentAttributeXY_constraint;
+ber_type_decoder_f SegmentAttributeXY_decode_ber;
+der_type_encoder_f SegmentAttributeXY_encode_der;
+xer_type_decoder_f SegmentAttributeXY_decode_xer;
+xer_type_encoder_f SegmentAttributeXY_encode_xer;
+jer_type_encoder_f SegmentAttributeXY_encode_jer;
+oer_type_decoder_f SegmentAttributeXY_decode_oer;
+oer_type_encoder_f SegmentAttributeXY_encode_oer;
+per_type_decoder_f SegmentAttributeXY_decode_uper;
+per_type_encoder_f SegmentAttributeXY_encode_uper;
+per_type_decoder_f SegmentAttributeXY_decode_aper;
+per_type_encoder_f SegmentAttributeXY_encode_aper;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* _SegmentAttributeXY_H_ */
+#include "asn_internal.h"