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/r2/ExteriorLights.c

@@ -0,0 +1,89 @@
+/*
+ * Generated by asn1c
+ * From ASN.1 module "ETSI-ITS-CDD"
+ * 	found in "TS102894-2v241-CDD.asn"
+ * 	`asn1c -fcompound-names -fincludes-quoted -no-gen-example -fprefix=Vanetza_ITS2_ -R`
+ */
+
+#include "ExteriorLights.h"
+
+int
+Vanetza_ITS2_ExteriorLights_constraint(const asn_TYPE_descriptor_t *td, const void *sptr,
+			asn_app_constraint_failed_f *ctfailcb, void *app_key) {
+	const BIT_STRING_t *st = (const BIT_STRING_t *)sptr;
+	size_t size;
+	
+	if(!sptr) {
+		ASN__CTFAIL(app_key, td, sptr,
+			"%s: value not given (%s:%d)",
+			td->name, __FILE__, __LINE__);
+		return -1;
+	}
+	
+	if(st->size > 0) {
+		/* Size in bits */
+		size = 8 * st->size - (st->bits_unused & 0x07);
+	} else {
+		size = 0;
+	}
+	
+	if((size == 8UL)) {
+		/* Constraint check succeeded */
+		return 0;
+	} else {
+		ASN__CTFAIL(app_key, td, sptr,
+			"%s: constraint failed (%s:%d)",
+			td->name, __FILE__, __LINE__);
+		return -1;
+	}
+}
+
+/*
+ * This type is implemented using BIT_STRING,
+ * so here we adjust the DEF accordingly.
+ */
+#if !defined(ASN_DISABLE_OER_SUPPORT)
+asn_oer_constraints_t asn_OER_type_Vanetza_ITS2_ExteriorLights_constr_1 CC_NOTUSED = {
+	{ 0, 0 },
+	8	/* (SIZE(8..8)) */};
+#endif  /* !defined(ASN_DISABLE_OER_SUPPORT) */
+#if !defined(ASN_DISABLE_UPER_SUPPORT) || !defined(ASN_DISABLE_APER_SUPPORT)
+asn_per_constraints_t asn_PER_type_Vanetza_ITS2_ExteriorLights_constr_1 CC_NOTUSED = {
+	{ APC_UNCONSTRAINED,	-1, -1,  0,  0 },
+	{ APC_CONSTRAINED,	 0,  0,  8,  8 }	/* (SIZE(8..8)) */,
+	0, 0	/* No PER value map */
+};
+#endif  /* !defined(ASN_DISABLE_UPER_SUPPORT) || !defined(ASN_DISABLE_APER_SUPPORT) */
+#if !defined(ASN_DISABLE_JER_SUPPORT)
+asn_jer_constraints_t asn_JER_type_Vanetza_ITS2_ExteriorLights_constr_1 CC_NOTUSED = {
+	8};
+#endif  /* !defined(ASN_DISABLE_JER_SUPPORT) */
+static const ber_tlv_tag_t asn_DEF_Vanetza_ITS2_ExteriorLights_tags_1[] = {
+	(ASN_TAG_CLASS_UNIVERSAL | (3 << 2))
+};
+asn_TYPE_descriptor_t asn_DEF_Vanetza_ITS2_ExteriorLights = {
+	"ExteriorLights",
+	"ExteriorLights",
+	&asn_OP_BIT_STRING,
+	asn_DEF_Vanetza_ITS2_ExteriorLights_tags_1,
+	sizeof(asn_DEF_Vanetza_ITS2_ExteriorLights_tags_1)
+		/sizeof(asn_DEF_Vanetza_ITS2_ExteriorLights_tags_1[0]), /* 1 */
+	asn_DEF_Vanetza_ITS2_ExteriorLights_tags_1,	/* Same as above */
+	sizeof(asn_DEF_Vanetza_ITS2_ExteriorLights_tags_1)
+		/sizeof(asn_DEF_Vanetza_ITS2_ExteriorLights_tags_1[0]), /* 1 */
+	{
+#if !defined(ASN_DISABLE_OER_SUPPORT)
+		&asn_OER_type_Vanetza_ITS2_ExteriorLights_constr_1,
+#endif  /* !defined(ASN_DISABLE_OER_SUPPORT) */
+#if !defined(ASN_DISABLE_UPER_SUPPORT) || !defined(ASN_DISABLE_APER_SUPPORT)
+		&asn_PER_type_Vanetza_ITS2_ExteriorLights_constr_1,
+#endif  /* !defined(ASN_DISABLE_UPER_SUPPORT) || !defined(ASN_DISABLE_APER_SUPPORT) */
+#if !defined(ASN_DISABLE_JER_SUPPORT)
+		&asn_JER_type_Vanetza_ITS2_ExteriorLights_constr_1,
+#endif  /* !defined(ASN_DISABLE_JER_SUPPORT) */
+		Vanetza_ITS2_ExteriorLights_constraint
+	},
+	0, 0,	/* Defined elsewhere */
+	&asn_SPC_BIT_STRING_specs	/* Additional specs */
+};
+