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FLASHING.md says how to take a newer version of the colleague's tree (copy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/GddStructure.h

@@ -0,0 +1,111 @@
+/*
+ * Generated by asn1c
+ * From ASN.1 module "GDD"
+ * 	found in "ISO14823.asn"
+ * 	`asn1c -fcompound-names -fincludes-quoted -no-gen-example -R`
+ */
+
+#ifndef	_GddStructure_H_
+#define	_GddStructure_H_
+
+
+#include "asn_application.h"
+
+/* Including external dependencies */
+#include "OCTET_STRING.h"
+#include "NativeEnumerated.h"
+#include "constr_CHOICE.h"
+#include "NativeInteger.h"
+#include "constr_SEQUENCE.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Dependencies */
+typedef enum GddStructure__pictogramCode__serviceCategoryCode_PR {
+	GddStructure__pictogramCode__serviceCategoryCode_PR_NOTHING,	/* No components present */
+	GddStructure__pictogramCode__serviceCategoryCode_PR_trafficSignPictogram,
+	GddStructure__pictogramCode__serviceCategoryCode_PR_publicFacilitiesPictogram,
+	GddStructure__pictogramCode__serviceCategoryCode_PR_ambientOrRoadConditionPictogram
+	/* Extensions may appear below */
+	
+} GddStructure__pictogramCode__serviceCategoryCode_PR;
+typedef enum GddStructure__pictogramCode__serviceCategoryCode__trafficSignPictogram {
+	GddStructure__pictogramCode__serviceCategoryCode__trafficSignPictogram_dangerWarning	= 0,
+	GddStructure__pictogramCode__serviceCategoryCode__trafficSignPictogram_regulatory	= 1,
+	GddStructure__pictogramCode__serviceCategoryCode__trafficSignPictogram_informative	= 2
+	/*
+	 * Enumeration is extensible
+	 */
+} e_GddStructure__pictogramCode__serviceCategoryCode__trafficSignPictogram;
+typedef enum GddStructure__pictogramCode__serviceCategoryCode__publicFacilitiesPictogram {
+	GddStructure__pictogramCode__serviceCategoryCode__publicFacilitiesPictogram_publicFacilities	= 0
+	/*
+	 * Enumeration is extensible
+	 */
+} e_GddStructure__pictogramCode__serviceCategoryCode__publicFacilitiesPictogram;
+typedef enum GddStructure__pictogramCode__serviceCategoryCode__ambientOrRoadConditionPictogram {
+	GddStructure__pictogramCode__serviceCategoryCode__ambientOrRoadConditionPictogram_ambientCondition	= 0,
+	GddStructure__pictogramCode__serviceCategoryCode__ambientOrRoadConditionPictogram_roadCondition	= 1
+	/*
+	 * Enumeration is extensible
+	 */
+} e_GddStructure__pictogramCode__serviceCategoryCode__ambientOrRoadConditionPictogram;
+
+/* Forward declarations */
+struct GddAttributes;
+
+/* GddStructure */
+typedef struct GddStructure {
+	struct GddStructure__pictogramCode {
+		OCTET_STRING_t	*countryCode;	/* OPTIONAL */
+		struct GddStructure__pictogramCode__serviceCategoryCode {
+			GddStructure__pictogramCode__serviceCategoryCode_PR present;
+			union GddStructure__pictogramCode__serviceCategoryCode_u {
+				long	 trafficSignPictogram;
+				long	 publicFacilitiesPictogram;
+				long	 ambientOrRoadConditionPictogram;
+				/*
+				 * This type is extensible,
+				 * possible extensions are below.
+				 */
+			} choice;
+			
+			/* Context for parsing across buffer boundaries */
+			asn_struct_ctx_t _asn_ctx;
+		} serviceCategoryCode;
+		struct GddStructure__pictogramCode__pictogramCategoryCode {
+			long	 nature;
+			long	 serialNumber;
+			
+			/* Context for parsing across buffer boundaries */
+			asn_struct_ctx_t _asn_ctx;
+		} pictogramCategoryCode;
+		
+		/* Context for parsing across buffer boundaries */
+		asn_struct_ctx_t _asn_ctx;
+	} pictogramCode;
+	struct GddAttributes	*attributes;	/* OPTIONAL */
+	
+	/* Context for parsing across buffer boundaries */
+	asn_struct_ctx_t _asn_ctx;
+} GddStructure_t;
+
+/* Implementation */
+/* extern asn_TYPE_descriptor_t asn_DEF_trafficSignPictogram_5;	// (Use -fall-defs-global to expose) */
+/* extern asn_TYPE_descriptor_t asn_DEF_publicFacilitiesPictogram_10;	// (Use -fall-defs-global to expose) */
+/* extern asn_TYPE_descriptor_t asn_DEF_ambientOrRoadConditionPictogram_13;	// (Use -fall-defs-global to expose) */
+extern asn_TYPE_descriptor_t asn_DEF_GddStructure;
+extern asn_SEQUENCE_specifics_t asn_SPC_GddStructure_specs_1;
+extern asn_TYPE_member_t asn_MBR_GddStructure_1[2];
+
+#ifdef __cplusplus
+}
+#endif
+
+/* Referred external types */
+#include "GddAttributes.h"
+
+#endif	/* _GddStructure_H_ */
+#include "asn_internal.h"