Add YOLOv5Face model support (#38)

* 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 YOLOv5Face Model support

* fixed examples/vision typos

* fixed runtime_option print func bugs

model_zoo/vision/yolov5face/cpp/README.md

@@ -0,0 +1,60 @@
+# 编译YOLOv5Face示例
+
+当前支持模型版本为：[YOLOv5Face CommitID:4fd1ead](https://github.com/deepcam-cn/yolov5-face/commit/4fd1ead)
+
+## 下载和解压预测库
+```bash
+wget https://bj.bcebos.com/paddle2onnx/fastdeploy/fastdeploy-linux-x64-0.0.3.tgz
+tar xvf fastdeploy-linux-x64-0.0.3.tgz
+```
+
+## 编译示例代码
+```bash
+mkdir build & cd build
+cmake ..
+make -j
+```
+
+## 获取ONNX文件
+
+访问[YOLOv5Face](https://github.com/deepcam-cn/yolov5-face)官方github库，按照指引下载安装，下载`yolov5s-face.pt` 模型，利用 `export.py` 得到`onnx`格式文件。
+
+* 下载yolov5face模型文件
+  ```
+  Link: https://pan.baidu.com/s/1fyzLxZYx7Ja1_PCIWRhxbw Link: eq0q  
+  https://drive.google.com/file/d/1zxaHeLDyID9YU4-hqK7KNepXIwbTkRIO/view?usp=sharing
+  ```
+
+* 导出onnx格式文件
+  ```bash
+  PYTHONPATH=. python export.py --weights weights/yolov5s-face.pt --img_size 640 640 --batch_size 1  
+  ```
+* onnx模型简化(可选)
+  ```bash
+  onnxsim yolov5s-face.onnx yolov5s-face.onnx
+  ```
+* 移动onnx文件到可执行文件的目录
+  ```bash
+  cp PATH/TO/yolov5s-face.onnx PATH/TO/model_zoo/vision/yolov5face/cpp/build
+  ```
+
+
+
+## 准备测试图片
+准备一张包含人脸的测试图片，命名为test.jpg，并拷贝到可执行文件所在的目录
+
+## 执行
+```bash
+./yolov5face_demo
+```
+
+执行完后可视化的结果保存在本地`vis_result.jpg`，同时会将检测框输出在终端，如下所示
+```
+aceDetectionResult: [xmin, ymin, xmax, ymax, score, (x, y) x 5]
+749.575256,375.122162, 775.008850, 407.858215, 0.851824, (756.933838,388.423157), (767.810974,387.932922), (762.617065,394.212341), (758.053101,399.073639), (767.370300,398.769470)
+897.833862,380.372864, 924.725281, 409.566803, 0.847505, (903.757202,390.221741), (914.575867,389.495911), (908.998901,395.983307), (905.803223,400.871429), (914.674438,400.268066)
+281.558197,367.739349, 305.474701, 397.860535, 0.840915, (287.018768,379.771088), (297.285004,378.755280), (292.057831,385.207367), (289.110962,390.010437), (297.535339,389.412048)
+132.922104,368.507263, 159.098541, 402.777283, 0.840232, (140.632492,382.361633), (151.900864,380.966156), (146.869186,388.505066), (141.930420,393.724670), (151.734604,392.808197)
+699.379700,306.743256, 723.219421, 336.533295, 0.840228, (705.688843,319.133301), (715.784668,318.449524), (711.107300,324.416016), (707.236633,328.671936), (716.088623,328.151794)
+# ...
+```