Vendor Parrot ARSDK protocol definitions

Bebop-era snapshot of common.xml and ardrone3.xml (BSD-3-Clause, Parrot SA),
with pyparrot's <myclass> rename reverted to Parrot's <class>. Provenance and
the comparison against upstream master are in arsdk-xml/PROVENANCE.md.

arsdk-xml/PROVENANCE.md

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+# Vendored ARSDK protocol definitions
+
+`common.xml` and `ardrone3.xml` are Parrot's own ARSDK command definitions,
+BSD-3-Clause (the licence text is in the header of each file,
+`Copyright (C) 2014 Parrot SA`). Upstream: https://github.com/Parrot-Developers/arsdk-xml
+
+These are the **Bebop-era** snapshot, taken from the copy distributed with
+pyparrot, which is contemporary with Bebop 2 firmware 4.7.1. Compared against
+upstream `master` on 2026-10-02:
+
+- No command id differs between the two.
+- Upstream adds 8 commands, none of which declare support for the Bebop 2
+  (product `090c`); they are ANAFI-era (`0914`, `091a`, `091f`, `0920`, `0924`).
+- Upstream has dropped 12 commands this firmware does have, including
+  `ardrone3.Piloting.AutoTakeOffMode` and the `setAutonomousFlight*` family.
+
+One local modification: pyparrot had renamed `<class>` to `<myclass>` to work
+around its `untangle` parser. That is reverted here, restoring Parrot's format.
+Nothing else is changed.
+
+Known gap in both sources: `ardrone3.Piloting.FlatTrim` (1-0-0) is defined in
+neither, although the firmware accepts it. See `protocol/xml_index.py`.