New features:
- A powerful convnext-tiny driven YOLOv7 model, mAP 43 without any augmentation training;
 - Convnext-tiny YOLOv7 (AKA yoloformer) get mAP-s 26 which 10 AP higher than MaskRCNN!;
 - YOLO2go proposed, will make a small weight size YOLO model (in mobilenetv3 or efficicientnetv2 backbone), will release in next version.