Version 2.2.4[Common]Updated to OpenCV3.3.1.[Common]Added ResnetSSDFaceDetectionExample, YoloObjectDetectionExample, YoloObjectDetectionWebCamTextureExample.

Version 2.2.6 [Android]Added arm64-v8a Architecture. [Common]Added ImwriteScreenCaptureExample.

Version 2.3.7 [WebGL]Fixed build errors that occur when DevelopmentBuild is enabled on the WegGL platform. [Common]Added optimization code using NativeArray class. ( require PlayerSettings.allowUnsafeCode flag, “OPENCV_USE_UNSAFE_CODE” ScriptingDefineSymbol and Unity2018.2 or later. ) [iOS]Fixed build errors that occur on the iOS platform with Unity2019.3 or later. [Common]Updated to WebCamTextureToMatHelper.cs v1.1.1.