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/support/BOOLEAN_oer.c

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>.
+ * All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#include "asn_internal.h"
+#include "BOOLEAN.h"
+
+/*
+ * Encode as Canonical OER.
+ */
+asn_enc_rval_t
+BOOLEAN_encode_oer(const asn_TYPE_descriptor_t *td,
+                   const asn_oer_constraints_t *constraints, const void *sptr,
+                   asn_app_consume_bytes_f *cb, void *app_key) {
+    asn_enc_rval_t er = { 1, 0, 0 };
+    const BOOLEAN_t *st = sptr;
+    uint8_t bool_value = *st ? 0xff : 0; /* 0xff mandated by OER */
+
+    (void)td;
+    (void)constraints;  /* Constraints are unused in OER */
+
+    if(cb(&bool_value, 1, app_key) < 0) {
+        ASN__ENCODE_FAILED;
+    } else {
+        ASN__ENCODED_OK(er);
+    }
+}
+
+asn_dec_rval_t
+BOOLEAN_decode_oer(const asn_codec_ctx_t *opt_codec_ctx,
+                   const asn_TYPE_descriptor_t *td,
+                   const asn_oer_constraints_t *constraints, void **sptr,
+                   const void *ptr, size_t size) {
+    asn_dec_rval_t ok = {RC_OK, 1};
+    BOOLEAN_t *st;
+
+    (void)opt_codec_ctx;
+    (void)td;
+    (void)constraints; /* Constraints are unused in OER */
+
+    if(size < 1) {
+        ASN__DECODE_STARVED;
+    }
+
+    if(!(st = *sptr)) {
+        st = (BOOLEAN_t *)(*sptr = CALLOC(1, sizeof(*st)));
+        if(!st) ASN__DECODE_FAILED;
+    }
+
+    *st = *(const uint8_t *)ptr;
+
+    return ok;
+}