.NET build and test

Migrate imaging from ImageSharp to SkiaSharp + add exhaustive Skia-based tests #382

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Run time

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Job	Run time
build (ubuntu-latest)	1m 38s
build (windows-latest)	3m 51s
build (macos-latest)	1m 21s
deployTest	-1s
deployRelease	-1s
	6m 48s