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This update changes the depthscale behavior from the original Normalize method to an improved version that behaves well even when points are closely spaced.Update art3d.pyFixed line lengths, added handling of zero-length datasets when computing the data scale.Updated art3d.py per feedbackRenamed get_data_scale and dscl to indicate that they are private, added description of function's purpose, and replaced np.power with np.sqrt.Update art3d.pyForgot this portion of the update earlier. Fixes the alpha draw order flipping as the point depth inverts even though the alpha should not change per point.Update art3d.py per reviewer feedbackOnly one dataset of (X, Y, Z) needs to be checked for zero length assuming all have the same length.Instead of using a small constant in the denominator it's cleaner to just check for '_dscl==0' and return ones instead.This applies for datasets with no datapoints, all the same datapoint such that no scale can be estimated.Update art3d.py per reviewer feedbackFixed some word wrapping, made get_data_scale more compact, replaced _dscl with the more descriptive _data_scale, removed redundant comments, added clearer comments for implementation of shading modes

Added kwargs for depth-shadingCreate depthshading_improvement.rstUpdate art3d.py formattingUpdate axes3d.py formattingUpdate depthshading_improvement.rst formatting

Remove legacy and inverted depth shade optionsRemove depthshade gettersgettermake depthshade_minalpha kwarg onlykwarg ordergetterUpdate image test failuresLintingfix masked scatter depth shadingremoved depthshade checkfix testsFix build warning

Co-authored-by: Elliott Sales de Andrade <quantum.analyst@gmail.com>Docstrings and typosCode review updatesvarnamevarname