ggrust 0.6.1

Added

• Side band axis theme elements, as R ggside's ggside.axis.*: theme(ggside_axis_text, ggside_axis_ticks, ggside_axis_ticks_length, ggside_axis_minor_ticks, ggside_axis_minor_ticks_length, ggside_axis_line), each with _x, _x_top, _x_bottom, _y, _y_left, _y_right variants. Anything unset falls back to the main axis_* theme.
• guide_axis_mark(): label a subset of an axis's breaks with leader lines (ComplexHeatmap's anno_mark as an axis guide). spread="nearest" or "even", link_width, padding. Works on discrete and continuous axes, every side, side bands, facets and gggrid(align=True).
• Several side bands per axis: side_pos= on a ggside layer overrides ggside() for that layer, side_band= names a band (bands on one side stack outward in plot order), and side_size= sets a band's share of the panel. scale_xsidey_* / scale_ysidex_* take side_pos= and side_band= to set one band's axis.
• Docs: the ggrust logo, and a showcase of plots on the README and docs home page.

Fixed

• A y side band's own x axis now reserves room for its ticks and labels (it could overflow the canvas).
• Blank side band axis labels no longer take up room.