Mcplot

* Tighter layout in `show_colors` and tight bounding box for
non-pdf output of `show_colors` and `show_cmaps`.
* Use class variables in test plot of `mcPlot`.
* Pass italic and bold along to `str2tex` in `text2plot`.
* Put $...$ around a, b, c only if mathrm=True in `abc2plot`.
* Use backslash with braces only if `usetex` not if only pdf
output in `abc2plot`. * Removed trailing > in html output.
* Add sron named colors.
* Add pale and dark colors to sron_colors.
* Use helper functions for all colors and colormaps.
* Order Matplotlib colormaps into categories.
* Use named colors from `matplotlib.colors` rather than
`plt.cm.colors`.
* Add `color_palette` = `get_cmap` to have a very similar function
as seaborn.
* Add alias `get_palette` = `get_cmap`, `print_palettes` =
`print_cmaps`, `show_palettes` = `show_cmaps` to have both
notations, `Matplotlib` and `seaborn`, respectively.
* Added `show_colors` to plot known named colors.
* Directly use color dictionaries in `get_cmap`, `get_color`,
`print_colors`, and `print_palettes`.
* Print named colors using predefined dictionaries.
* Rename `print_layout_options` to `print_class_variables`,
using `self.__dict__` to access all variables.
* Remove `desc`, `argstr`, and `parents` keyword arguments from
`get_command_line_arguments` to not interfere with possible
child method.
* If nor `desc` nor `argstr` given, the command line will be
bypassed in order to use the class `mcPlot` without the command
line from within Python.
* Use 10/12 instead of 4/5 to reduce figsize on screen windows.
* Also `-o` and `--output` for `-p output_plot_filename` possible.
* Prefix IPCC colors with ipcc:.
* Use : instead of _ in colormap names.
* Start Brewer colors after Matplotlib colors at new page in
`show_palettes`.
* Renamed file `mcplot.py` to `class_mcplot.py`.
* Change class variables `lwidth` to `lw`, `alwidth` to `alw`,
`elwidth` to `elw`, `msize` to `ms`, `mwidth` to `mew` in
`mcPlot`.
* Added `loc` and set `xbbox` and `ybbox` in `mcPlot` so that
legend is in upper right corner.
* Change `llxbbox` to `xbbox`, `llybbox` to `ybbox`, `llrspace` to
`labelspacing`, `llcspace` to names of Matplotlib's `Axes.legend`.
* Reorder `ldashes` from little to more dots between dashes.
* Set `dxabc` and `dyabc` to upper left corner of plot in
`mcPlot`.
* Use same left, right, bottom, top as GridSpec of Matplotlib in
`mcPlot`.

* First standalone release of ``mplot``, extracting all plotting
routines from ``pyjams``.
* Rudimentary documentation with README.rst.

* Argument 'parents' to `mcPlot` to pass extra command line
arguments.
* Added upper keyword in `abc2plot`.
* Use DejaVuSans and DejaVueSerif as standard fonts if not LaTeX
in `mcPlot`.
* Add `mcPlot` method `print_layout_options`.
* Added IPCC WG1 colors.
* Set default options for `mcPlot` if not given on command line.

* Set filename without suffix as default plot name in `mcPlot`.
* Allow ncol=1 in `color.get_cmap`.

* Replace plotly with hvplot in `mcPlot`.
* Add unicode symbol degree \u00B0, which gets replaced by ^\circ
if usetex==True in str2tex.
* Do not escape % if not usetex in str2tex.

* Do not set color for missing data; only existed for sron palettes.
* Add --dpi as a standard option in `mcPlot`.
* Use mpl.colormaps[name] instead of mpl.colormaps.get_cmap(name)
to replace mpl.cm.get_cmap(name) to work with matplotlib < v3.6.