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/TransitVehicleOccupancy.c

@@ -0,0 +1,83 @@
+/*
+ * Generated by asn1c
+ * From ASN.1 module "DSRC"
+ * 	found in "ISO19091.asn"
+ * 	`asn1c -fcompound-names -fincludes-quoted -no-gen-example -R`
+ */
+
+#include "TransitVehicleOccupancy.h"
+
+/*
+ * This type is implemented using NativeEnumerated,
+ * so here we adjust the DEF accordingly.
+ */
+#if !defined(ASN_DISABLE_OER_SUPPORT)
+asn_oer_constraints_t asn_OER_type_TransitVehicleOccupancy_constr_1 CC_NOTUSED = {
+	{ 0, 0 },
+	-1};
+#endif  /* !defined(ASN_DISABLE_OER_SUPPORT) */
+#if !defined(ASN_DISABLE_UPER_SUPPORT) || !defined(ASN_DISABLE_APER_SUPPORT)
+asn_per_constraints_t asn_PER_type_TransitVehicleOccupancy_constr_1 CC_NOTUSED = {
+	{ APC_CONSTRAINED,	 3,  3,  0,  7 }	/* (0..7) */,
+	{ APC_UNCONSTRAINED,	-1, -1,  0,  0 },
+	0, 0	/* No PER value map */
+};
+#endif  /* !defined(ASN_DISABLE_UPER_SUPPORT) || !defined(ASN_DISABLE_APER_SUPPORT) */
+static const asn_INTEGER_enum_map_t asn_MAP_TransitVehicleOccupancy_value2enum_1[] = {
+	{ 0,	16,	"occupancyUnknown" },
+	{ 1,	14,	"occupancyEmpty" },
+	{ 2,	16,	"occupancyVeryLow" },
+	{ 3,	12,	"occupancyLow" },
+	{ 4,	12,	"occupancyMed" },
+	{ 5,	13,	"occupancyHigh" },
+	{ 6,	19,	"occupancyNearlyFull" },
+	{ 7,	13,	"occupancyFull" }
+};
+static const unsigned int asn_MAP_TransitVehicleOccupancy_enum2value_1[] = {
+	1,	/* occupancyEmpty(1) */
+	7,	/* occupancyFull(7) */
+	5,	/* occupancyHigh(5) */
+	3,	/* occupancyLow(3) */
+	4,	/* occupancyMed(4) */
+	6,	/* occupancyNearlyFull(6) */
+	0,	/* occupancyUnknown(0) */
+	2	/* occupancyVeryLow(2) */
+};
+const asn_INTEGER_specifics_t asn_SPC_TransitVehicleOccupancy_specs_1 = {
+	asn_MAP_TransitVehicleOccupancy_value2enum_1,	/* "tag" => N; sorted by tag */
+	asn_MAP_TransitVehicleOccupancy_enum2value_1,	/* N => "tag"; sorted by N */
+	8,	/* Number of elements in the maps */
+	0,	/* Enumeration is not extensible */
+	1,	/* Strict enumeration */
+	0,	/* Native long size */
+	0
+};
+static const ber_tlv_tag_t asn_DEF_TransitVehicleOccupancy_tags_1[] = {
+	(ASN_TAG_CLASS_UNIVERSAL | (10 << 2))
+};
+asn_TYPE_descriptor_t asn_DEF_TransitVehicleOccupancy = {
+	"TransitVehicleOccupancy",
+	"TransitVehicleOccupancy",
+	&asn_OP_NativeEnumerated,
+	asn_DEF_TransitVehicleOccupancy_tags_1,
+	sizeof(asn_DEF_TransitVehicleOccupancy_tags_1)
+		/sizeof(asn_DEF_TransitVehicleOccupancy_tags_1[0]), /* 1 */
+	asn_DEF_TransitVehicleOccupancy_tags_1,	/* Same as above */
+	sizeof(asn_DEF_TransitVehicleOccupancy_tags_1)
+		/sizeof(asn_DEF_TransitVehicleOccupancy_tags_1[0]), /* 1 */
+	{
+#if !defined(ASN_DISABLE_OER_SUPPORT)
+		&asn_OER_type_TransitVehicleOccupancy_constr_1,
+#endif  /* !defined(ASN_DISABLE_OER_SUPPORT) */
+#if !defined(ASN_DISABLE_UPER_SUPPORT) || !defined(ASN_DISABLE_APER_SUPPORT)
+		&asn_PER_type_TransitVehicleOccupancy_constr_1,
+#endif  /* !defined(ASN_DISABLE_UPER_SUPPORT) || !defined(ASN_DISABLE_APER_SUPPORT) */
+#if !defined(ASN_DISABLE_JER_SUPPORT)
+		0,
+#endif  /* !defined(ASN_DISABLE_JER_SUPPORT) */
+		NativeEnumerated_constraint
+	},
+	0, 0,	/* Defined elsewhere */
+	&asn_SPC_TransitVehicleOccupancy_specs_1	/* Additional specs */
+};
+