* 1. add -o command for pipeline;
2. remove basemode config;
3. add example configs for pphuman.

* copyright to Copyright

* 1. update docs for quick start;
2. delete merge_model_dir;
3. move cfg codes to cfg_utils.py

* Update QUICK_STARTED.md

* Update PPVehicle_QUICK_STARTED.md

* Update pphuman_action.md

* Update pphuman_action_en.md

* Update pphuman_attribute.md

* Update pphuman_attribute_en.md

* Update cfg_utils.py

* ppvehicle tutorials template

* rename pphuman docs

* update quickstart

* update ppdet docs & remove static code, test=document_fix

* add pphuman doc, test=document_fix

* update action doc, test=document_fix

* update activity, test=document_fix

* update attr docs

* update more

* update docs

* given inference model path, download model automatically

* encapsulate auto download model as a function

* given note that default model dir is download link

* change attr model download path to https://bj.bcebos.com/v1/paddledet/models/pipeline/PPLCNet_x1_0_person_attribute_945_infer.zip

* attribute docs update

* fix mtmct

* update docs

* fix pphuman cfg doc, test=document_fix

* fix doc, test=document_fix

* remove en readme doc, test=document_fix

* refactor doc, test=document_fix

* update yolox & yolov5, test=document_fix

* Update README_cn.md

* update doc, test=document_fix

* Update readme and pphuman readme

* Update README.md

* add data & customize, test=document_fix

* update readme

* Update README_cn.md

* Update README_cn.md

* add template, test=document_fix
Co-authored-by: NYixinKristy <576550767@qq.com>

* add_en_doc_for_pphuman, test=document_fix

* update link, test=document_fix

* add attr dataset link, test=document_fix

* correct link, test=document_fix

* Create README_en.md

* Update README_en.md

* add attr doc

* update attr intro