MNT: trap inappropriate use of color kwarg in scatter; closes #6266 #6267
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This slightly modifies and extends the special-casing of color-related
kwargs that would otherwise be passed in to a Collection instance.
Attempts to use 'color' in place of the 'c' kwarg for color-mapping
in scatter are now trapped with a ValueError in most cases. There
are still cases that are impossible to trap: a sequence of 3 or 4
floats between 0 and 1 could be either a single color spec or a
sequence of values to be color-mapped.