* add keypoint infer and visualize into Pipeline

* add independent action model inference

* add action inference into pipeline, still in working

* test different display frames and normalization methods

* use bbox and scale normalization

* Remove debug info and Optimize code structure

* remove useless visual param

* make action parameters configurable

* add pphuman doc

* add pphuman doc & add enable_attr, enable_action

* update doc

* update pphuman-tech.png

* refine attr vis & refine model_dir in config

* support model_dir in command line

* refine pipeline visualize

* add fps vis

* refine vis when box is empty

* add pedestrian pipeline

* add pipe_timer