Improve plot drawing (adaptive sampling)

[stevenpetryk]

This reworks how function plots are generated. In terms of API changes, this is the situation:

• FunctionGraph.OfX, .OfY, and .Parametric are now under Plot (Plot.OfX, etc.)
• All of these components now have a minSamplingDepth and maxSamplingDepth prop.
• VectorField is now under the Plot namespace (Plot.VectorField).

Internally, the smartSmooth function has been revised to do less work. The passed-in function is evaluated less frequently, error is calculated based on square distance rather than triangle area (again, less work), and array allocations are reduced.

• Fixes #74
• Closes #3

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Name	Status	Preview	Updated
mafs	✅ Ready (Inspect)	Visit Preview	Jan 8, 2023 at 9:41PM (UTC)