remove the YOLO-World open-vocabulary engine

Deletes the yoloworld_onnx engine, the CLIP BPE tokenizer, the standalone
test binary and both export scripts. Drops the update_vocabulary input and
the yoloworld_onnx/open_vocab dispatch from main.cc, along with the now
unused Engine::set_labels. Documentation follows.

scripts/install_linux_arm.sh

@@ -12,7 +12,7 @@
 #
 # ONNX Runtime: Microsoft does not publish official GPU binaries for ARM64.
 #   The native engine (ZED SDK built-in TensorRT) works without ONNX Runtime.
-#   To use the open_vocab engine, build ONNX Runtime from source:
+#   To use the yolo_onnx engine, build ONNX Runtime from source:
 #   https://onnxruntime.ai/docs/build/eps.html#tensorrt
 set -euo pipefail
 
@@ -67,7 +67,7 @@ fi
 echo ""
 echo ">>> ONNX Runtime (ARM64 GPU): no official pre-built binary available."
 echo "    The native ZED engine works without ONNX Runtime."
-echo "    To use the open_vocab engine, build from source:"
+echo "    To use the yolo_onnx engine, build from source:"
 echo "      https://onnxruntime.ai/docs/build/eps.html#tensorrt"
 echo ""