Template:Tree list/branching

Implements Wikipedia's Tree list template to present data in a heirarchy. This is useful for branching quests, taxonomical structures, or other branching, parent/child structures. It works by wrapping an unordered list in CSS styles that alter the decoration to create the visual effect. It works in a set with other templates to create this effect:

See the Tree list template page for documentation and examples.
See the tests page for basic tests whenever modifications are made.