Create new plotting API

[akrherz]

My pyiem.plot.geoplot has become such a mess and is not sustainable, so time to flush out a new approach. Here's some implementation thoughts to target...

Layouts and available resource names

layout	description	names
default	The default creation of one mpl (non-geo) axes	ax, cax
None	No axes are created	n/a
geopanel	A single geopanel	gp, cax

from pyiem.plot import IEMFigure

fig = IEMFigure(
    layout=...,  # domain like default, fourpanel, None
    title=....
    
)

WIP, more later as I think about this.