Keep vanetza-idf in obu-firmware, so a plain clone builds the firmware

obu-firmware builds against the vanetza-idf C-ITS library, which until now
came from the colleague's microbu-esp32c5 tree beside the repository and was
not tracked here, so a clone of this repository could not build the firmware
it ships. The library alone is now part of obu-firmware, as
obu-firmware/external/vanetza-idf: their external/vanetza-idf at commit
cf4b99f, unchanged (9775 files; see its PROVENANCE.md). CMake takes it from
there by default; -DVANETZA_IDF_DIR still points the build elsewhere.

The rest of the colleague's tree (their own VAM firmware, PKI tooling,
station-link Python tools, the V2X2MAP bridge) stays out of this repository
and gitignored; nothing is pushed to their repository. NOTES.md, docs/06,
TODO.md and the pcap verifier's usage line point at the new location.

obu-firmware/external/vanetza-idf/vanetza/asn1/its/InternationalSign-applicablePeriod.h

@@ -0,0 +1,73 @@
+/*
+ * Generated by asn1c
+ * From ASN.1 module "GDD"
+ * 	found in "ISO14823.asn"
+ * 	`asn1c -fcompound-names -fincludes-quoted -no-gen-example -R`
+ */
+
+#ifndef	_InternationalSign_applicablePeriod_H_
+#define	_InternationalSign_applicablePeriod_H_
+
+
+#include "asn_application.h"
+
+/* Including external dependencies */
+#include "RepeatingPeriodDayTypes.h"
+#include "DayOfWeek.h"
+#include "NativeInteger.h"
+#include "constr_SEQUENCE.h"
+#include "MonthDay.h"
+#include "HoursMinutes.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Forward declarations */
+struct HoursMinutes;
+
+/* InternationalSign-applicablePeriod */
+typedef struct InternationalSign_applicablePeriod {
+	struct InternationalSign_applicablePeriod__year {
+		long	 yearRangeStartYear;
+		long	 yearRangeEndYear;
+		
+		/* Context for parsing across buffer boundaries */
+		asn_struct_ctx_t _asn_ctx;
+	} *year;
+	struct InternationalSign_applicablePeriod__month_day {
+		MonthDay_t	 dateRangeStartMonthDay;
+		MonthDay_t	 dateRangeEndMonthDay;
+		
+		/* Context for parsing across buffer boundaries */
+		asn_struct_ctx_t _asn_ctx;
+	} *month_day;
+	RepeatingPeriodDayTypes_t	*repeatingPeriodDayTypes;	/* OPTIONAL */
+	struct InternationalSign_applicablePeriod__hourMinutes {
+		HoursMinutes_t	 timeRangeStartTime;
+		HoursMinutes_t	 timeRangeEndTime;
+		
+		/* Context for parsing across buffer boundaries */
+		asn_struct_ctx_t _asn_ctx;
+	} *hourMinutes;
+	DayOfWeek_t	*dateRangeOfWeek;	/* OPTIONAL */
+	struct HoursMinutes	*durationHourMinute;	/* OPTIONAL */
+	
+	/* Context for parsing across buffer boundaries */
+	asn_struct_ctx_t _asn_ctx;
+} InternationalSign_applicablePeriod_t;
+
+/* Implementation */
+extern asn_TYPE_descriptor_t asn_DEF_InternationalSign_applicablePeriod;
+extern asn_SEQUENCE_specifics_t asn_SPC_InternationalSign_applicablePeriod_specs_1;
+extern asn_TYPE_member_t asn_MBR_InternationalSign_applicablePeriod_1[6];
+
+#ifdef __cplusplus
+}
+#endif
+
+/* Referred external types */
+#include "HoursMinutes.h"
+
+#endif	/* _InternationalSign_applicablePeriod_H_ */
+#include "asn_internal.h"