* Add multi-label function for yolov5
* Update README.md
Update doc
* Update fastdeploy_runtime.cc
fix variable option.trt_max_shape wrong name
* Update runtime_option.md
Update resnet model dynamic shape setting name from images to x
* Fix bug when inference result boxes are empty
* Delete detection.py
* Align fastdeploy prediction precision with yolov5
* Change name of Sort function to SortDetectionResult
* Add stride max_wh is_mini_pad property in __init__.py and unify format of getting image width and length
* Change mergesort.cc to sort_det_res.cc