* add BSN and BMN models to PaddleVideo

* modify codes to fix metrics evaluation and readme

* add copyright for gen_infer_list.py and modify the content of README

* add BSN and BMN in models/README.md

* fix reader, metrics, frameworks to increase universality of PaddleVideo

* change config files from .txt to .yaml

* fix input to use PyReader and modify on readme to fit new codes

* adjust code structure and modify configs and readme to fit standard

* modify links of pdparams in readme and scripts

* fix pickle.dump in python3 and modify on readme of attention_lstm

* add description of weights argument in eval/predict/inference_model.py

* add readme for ctcn metrics calculation

* fix code format in metrics/detections/README.md

* fix code format and add ``` in code lines