ADD YOLOX-Body-Head-Hand-Face

[larryaxinc]

#1675
Which model to use not decided yet. Once decided can merge.

[kyakuno]

@larryaxinc I uploaded model here.
https://storage.googleapis.com/ailia-models/yolox_body_head_hand_face/yolox_l_body_head_hand_face_0086_0.5143_post_1x3x480x640.onnx

• Please add license file https://github.com/PINTO0309/PINTO_model_zoo/blob/main/434_YOLOX-Body-Head-Hand-Face/LICENSE
• Please add model to /README.md
• Please add model to /https://github.com/axinc-ai/ailia-models/blob/master/scripts/download_all_models.sh

[kyakuno]

Also I generated prototxt and upload it. Please use these files.
https://storage.googleapis.com/ailia-models/yolox_body_head_hand_face/yolox_l_body_head_hand_face_0086_0.5143_post_1x3x480x640.onnx.prototxt

[kyakuno]

Please change
yolox.py
to
yolox_body_head_hand_face.py
.