Complete native codegen milestone gate (#50)

tools/generate_rust_mapping.py

@@ -1164,8 +1164,8 @@ def method_receiver(owner: dict, item: dict) -> tuple[str, str]:
         return "&self", "shared_self"
     if owner["doc_id"] == "T:LibreMetaverse.BitPack" and item["name"].startswith(("Pack", "Unpack")):
         return "&mut self", "mutable_self"
-    if owner["doc_id"].startswith("T:LibreMetaverse.Packets.") and item["name"].startswith(
-        "FromBytes"
+    if owner["doc_id"].startswith("T:LibreMetaverse.Packets.") and (
+        item["name"].startswith("FromBytes") or item["name"] in {"FromOSD", "PacketFromOSD"}
     ):
         return "&mut self", "mutable_self"
     observers = ("Get", "TryGet", "Find", "Contains", "Has", "Is", "Can", "To", "Equals", "Compare")