Add support for Color Emoji support
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- C#
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Description
Currently when you render emojis in WPF, they are rendered black'n'white, and not rendering with the correct emoji color.
It would be good if we could update the text rasterizer renderers to render with the correct color.
There's a proof of concept implementation here: https://github.com/samhocevar/emoji.wpf, so perhaps @samhocevar would be willing to contribute? (I'm guessing this would be done on the DirectWrite level though)
Screenshot from Emoji.WPF
Documentation how this works from https://blogs.windows.com/buildingapps/2017/06/06/using-color-fonts-beautiful-text-icons/#Crwe2VHsjP5PgAXS.97 (thanks @mikedn):
Also for discussion: Should we have a [IsColorFontEnabled](https://docs.microsoft.com/en-us/uwp/api/Windows.UI.Xaml.Controls.TextBlock#Windows_UI_Xaml_Controls_TextBlock_IsColorFontEnabled) property that turns this behavior on/off, and should it be default like in UWP (behavior change). Also only 8.1+ uses the `D2D1_DRAW_TEXT_OPTIONS_ENABLE_COLOR_FONT` flag, so I'm assuming the behavior would always be black/white on Win7 and 8.0
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