Quite a bit of work remaining here to handle edge cases:

• General inheritance implementation
  • Handle include elements: translate paths when a relative path will work, otherwise expand the element.
  • Handle recursive inheritdoc elements
  • Define behavior when a library contains <inheritdoc> elements in its documentation
• inheritdoc (DOC205)
  • Handle overridden root elements
  • Support nesting <inheritdoc> within a root element, e.g. within a <summary> element
  • Support the path/select attributes
  • Support the cref attribute
• autoinheritdoc (DOC206)
  • Exclusions for overridden root elements, which may be built on path/select support
  • Normalization of text
  • Define behavior for cases where included documentation is not available
  • Support the cref attribute
  • Support placement as a nested element

Closes #16