Enhancement: support for family tree/dendrogram visualization

[biohoo]

User Story As a person who is supporting my parents' desire to track lineage, I require the ability to create family tree diagrams from gedcom files so that I can better visualize my lineage.

Acceptance Criteria

• Export to a .dot file
• Export families to a compatible dataframe that includes the following fields: [Parent_ID, Parent_Name, Child_ID, Child_Name] and any other fields that may be in an IndividualElement and could be useful for graph rendering.
• Fully-connected family tree branches are exported to a compatible image OR an interactive visualization that supports static image export (think plot.ly tree diagrams)