Feature/visualization

Added keyword arguments to control plot properties, added separate mechanism labels, changed default values

Added hoverinfo functions for mechanism labels and vertices, added "title" keyword argument, implemented cosmetic changes to code

Formatted code with black

Substituted `edge_figure` (generated with px.line3d() function) with `edges_trace`(generated with go.Scatter3d() function) for consistency with other trace generation and possibility to manipulate trace.

Substituted initialization of figure_data as list with initialization of figure as plotly figure object. Added traces and layout to figure with appropriate plotly function.

Used magic underscore to define scene axes

Added UMAP axes labels

Changed trace names

Modified vertex_sizes function to make it work for both mechanisms and purviews

Added chunk_list function to chunk a list

Added keyword arguments to plot_relations function

Modified axes and layout

Added renames labels_mechanisms_trace and added vertices_mechanisms_trace to show mechanisms as third marker between cause and effect vertices

Added functions label_state and label_two_relation

Replaces label_two_relation() with hovertext_relation()

Added def label_relation() function

Edited label_relation() and hovertext_relation() functions

Added 2-relations (edges) as individual traces, added 2-relation hover labels, grouped all traces in a single legend-group to show/hide together

Renamed vertex_sizes() function to normalize_sizes() since applicable to edges and triangles too.

Rounded phis to 4 decimals, added 2-relation phis as edge width normalized based on corresponding kwarg, adjusted default args.

Plotting triangles as separate traces

Added 3-Relations hover label, added hoverlabel for mechanism and purview labels, formatted with black

Changed n to r for relation index

Added save digraph function, added digraph plot, formatted code

Added option to use distinction orders as z values

Renamed `plot_relations()` to `plot_ces()`

Added function `get_edge_color()` for two relations based on type of overlap