GetPart(TreeGuidePart) Method
    Get the set of characters used to render the corresponding 
        TreeGuidePart.
    public abstract string GetPart(TreeGuidePart part)
        - Namespace
 - Spectre
.Console  - Containing Type
 - TreeGuide
 
Parameters
- TreeGuidePart part
 - The part of the tree to get rendering string for.
 
Returns
- string