New more-accessible color cycle

A new color cycle named 'ccs10' was added. This cycle was constructed using a

combination of algorithmically-enforced accessibility constraints, including

color-vision-deficiency modeling, and a machine-learning-based aesthetics model

developed from a crowdsourced color-preference survey. It aims to be both

generally pleasing aesthetically and colorblind accessible such that it could

serve as a default in the aim of universal design. For more details

see `Petroff, M. A.: "Accessible Color Sequences for Data Visualization"

<https://arxiv.org/abs/2107.02270>`_ and related `SciPy talk`_. A demonstration

is included in the style sheets reference_. To load this color cycle in place

of the default::

.. _reference: https://matplotlib.org/gallery/style_sheets/style_sheets_reference.html

.. _SciPy talk: https://www.youtube.com/watch?v=Gapv8wR5DYU

# Color cycle survey palette from Petroff (2021):

# https://arxiv.org/abs/2107.02270

# https://github.com/mpetroff/accessible-color-cycles

axes.prop_cycle: cycler('color', ['3f90da', 'ffa90e', 'bd1f01', '94a4a2', '832db6', 'a96b59', 'e76300', 'b9ac70', '717581', '92dadd'])

patch.facecolor: 3f90da