axes_grid and axisartist removals

The following deprecated APIs have been removed:

• SubplotDivider.figbox, SubplotDivider.update_params,

• SubplotDivider.get_geometry (use get_subplotspec instead),

• change_geometry (use set_subplotspec instead),

• ParasiteAxesBase.update_viewlim (use apply_aspect instead),

• ParasiteAxesAuxTransBase (use ParasiteAxesBase instead),

• parasite_axes_auxtrans_class_factory (use parasite_axes_class_factory instead),

• ParasiteAxesAuxTrans (use ParasiteAxes instead),