Add styling options

hierplane_styles(
  node_type_to_style = NULL,
  link_to_positions = NULL,
  link_name_to_label = NULL
)

Arguments

node_type_to_style	A named list of mappings from node type to styles. See `hierplane::style_options$node_type_to_style` for available options.
link_to_positions	A named list of mappings from link to node placements. See `hierplane::style_options$link_to_positions` for available options.
link_name_to_label	A named list of mappings from link names to labels (e.g. from "Episode" to "Ep").