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 FLASHING.md says how to take a newer version of the colleague's tree (copy it over the folder, rebuild, test, commit).
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+# ETSI ITS ASN.1
+
+The ASN.1 files in this directory are a slightly patched subset of the files published by ETSI for ITS Release 2.
+You can find the original files on [ETSI Forge](https://forge.etsi.org/rep/ITS/asn1). Our changes are documented below.
+These files are distributed under a permissive license:
+
+> Copyright 2019 ETSI
+>
+> Redistribution and use in source and binary forms, with or without 
+> modification, are permitted provided that the following conditions are met:
+> 1. Redistributions of source code must retain the above copyright notice, 
+>    this list of conditions and the following disclaimer.
+> 2. Redistributions in binary form must reproduce the above copyright notice, 
+>    this list of conditions and the following disclaimer in the documentation 
+>    and/or other materials provided with the distribution.
+> 3. Neither the name of the copyright holder nor the names of its contributors 
+>    may be used to endorse or promote products derived from this software without 
+>    specific prior written permission.
+>
+> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
+> ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+> WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
+> IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
+> INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
+> BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
+> DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
+> LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
+> OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 
+> OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+# Changes
+
+## CDD
+
+Removed obsolete `ActionID` and `StationID` data elements. The generated file names clash with those of `ActionId` and `StationId` on case-insensitive filesystems.
+
+## CPM
+
+Updated CDD imports.
+
+## VAM
+
+Updated CDD imports.