0.5.3

• feat: add axes, axis_titles, and guides parameters control combining plots by 'split_by'
• fix(heatmap): ensure 'columns_by' is factorized before split
• fix(heatmap): fix error when legend.position is set to 'none'
• feat: allow legend.position and legend.direction to be set for subplots separately

Full Changelog: 0.5.2...0.5.3