Moved unit tests for DrawableBezier to it's own class. #967

Job	Run time
MacOS (Q8/Q16/Q16-HDRI)	3m 16s
Linux musl (Q8/Q16/Q16-HDRI, x64)	4m 6s
Linux (Q8/Q16/Q16-HDRI, x64)	4m 25s
MacOS (Q8/Q16/Q16-HDRI, arm64)	1m 54s
Library (Core)	8m 17s
Windows (Q8, x86)	8m 44s
Library (SystemDrawing)	8m 5s
Windows (Q8, x64)	8m 38s
Library (SystemWindowsMedia)	6m 47s
Windows (Q8, arm64)	7m 1s
Windows (Q8, Any CPU)	8m 38s
Windows (Q8-OpenMP, x64)	8m 24s
Windows (Q8-OpenMP, arm64)	6m 28s
Windows (Q16, x86)	8m 46s
Windows (Q16, x64)	8m 25s
Windows (Q16, arm64)	7m 49s
Windows (Q16, Any CPU)	8m 28s
Windows (Q16-OpenMP, x64)	9m 3s
Windows (Q16-OpenMP, arm64)	6m 50s
Windows (Q16-HDRI, x86)	9m 8s
Windows (Q16-HDRI, x64)	8m 34s
Windows (Q16-HDRI, arm64)	6m 54s
Windows (Q16-HDRI, Any CPU)	8m 29s
Windows (Q16-HDRI-OpenMP, x64)	9m 51s
Windows (Q16-HDRI-OpenMP, arm64)	6m 49s
	3h 3m 49s

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