Version 2.1.2[Common]Fixed WebCamTextureToMatHelper.cs.(flipVertical and flipHorizontal flag)

Version 2.2.9 [Linux]Simplified the Linux platform setup procedure. [Common]Added support for Utils. setDebugMode() method on all platforms. [Common]Updated to WebCamTextureToMatHelper.cs v1.0.9. [Common]Added MatToTextureInRenderThreadExample and AlphaBlendingExample.

Version 2.1.1[Common]Fixed OpenCVForUnityMenuItem.cs.(No valid name for platform: 11 Error)[Common]Added Utils.textureToTexture2D() method.[Common]Added Mat class operators. [Common] Added PolygonFilterSample.