Feature: Expand the function of PlotSurface #141
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This PR expands the function of PlotSurface. It allows an additional series of data as input. The value could be used to indicate the property at each point in the 3D point cloud, such as temperature, density, potential, etc. This function seems to be required in a wide variety of scientific figures.
The example DemoSurfacePlots in implot3d_demo.cpp is modified to show the effect (see the animation below). The existing plot functionality is unaffected.

DemoSurfacePlots
It is noteworthy that there are quite a few codes in this modification duplicated from the original PlotSurface. I will be very happy if the maintainer could consider to merge the modification into PlotSurface in a more elegant way.
Please let me know if there is any comment or suggestion.