* Support new model PaddleSeg

* Fix conflict

* PaddleSeg add visulization function

* fix bug

* Fix BindPPSeg wrong name

* Fix variable name

* Update by comments

* Add ppseg-unet example python version

Co-authored-by: Jason <jiangjiajun@baidu.com>

* update .gitignore

* Added checking for cmake include dir

* fixed missing trt_backend option bug when init from trt

* remove un-need data layout and add pre-check for dtype

* changed RGB2BRG to BGR2RGB in ppcls model

* add model_zoo yolov6 c++/python demo

* fixed CMakeLists.txt typos

* update yolov6 cpp/README.md

* add yolox c++/pybind and model_zoo demo

* move some helpers to private

* fixed CMakeLists.txt typos

* add normalize with alpha and beta

* add version notes for yolov5/yolov6/yolox

* add copyright to yolov5.cc

* revert normalize

* fixed some bugs in yolox

* Add NanoDet-Plus Model support

Co-authored-by: Jason <jiangjiajun@baidu.com>

* Add Paddle Inference as backend

* Update CMakeLists.txt

* Fix default backend option

* Fix some log bug and backend choosing strategy

* Add version of g++