Globalization and accessibility for tile and toast notifications (Windows Store apps)

http://msdn.microsoft.com/en-us/library/windows/apps/hh831183.aspx

做 HighContrast时，采用以下分目录方式：

/ProjectFolder
    /images
        welcome.png
        /contrast-black
            welcome.png
        /contrast-white
            welcome.png
        /fr-FR
            welcome.png
            /contrast-black
                welcome.png
            /contrast-white
                welcome.png
        /ja-JP
            welcome.png
            /contrast-black
                welcome.png
            /contrast-white
                welcome.png

在Package.appxmanifest中

<m2:SplashScreenImage="AssetsAppImgSplashScreen.png" BackgroundColor="#2A6EBB" />

在高对比度时，这里的BackgroundColor 会被忽略掉