raphaelquast/EOmaps: EOmaps v4.2.3

A minor bugfix release.

• there is now an option to completely disable extension arrows when adding a colorbar (e.g. with m.add_colorbar(add_extend_arrows=False))

• it is now possible to set the "layer" of an inset-map on initialization (e.g. m.new_inset_map(layer="adsf") (by default, the "all" layer is used for inset-maps!)

• fix using alpha-transparency with wms and wmts services (e.g. m.add_wms.<service>.add_layer.<layer>(alpha=0.5))
• fix colors of histogram-bins if the bins extend over more than one colorbar-split
• fix position of colorbar extension-arrows after using m.subplots_adjust
• fix appearance of "vertical" colorbar extension arrows