Mpl-plotter

2D axis tick bound and location methods recovered, minor bugs resolved.

panes` now accepts a `shape` argument so as to use user-defined plot grids. Check the [`matplotlib.pyplot.subplot2grid`](https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.pyplot.subplot2grid.html)) documentation for more information on the `shape` parameter.

Major internal rewrite.

API inconsistencies corrected.

Major internal rewrite and breaking API changes.

Removed color bar title size bug

Significant pane plot improvements.