@Override
		public String toString() {
			return item.toString();
		}
A class that will take in a group of help directories and create a tree of
help Table of Contents (TOC) items.  Ideally, this tree can be used to create a single
TOC document, or individual TOC documents, one for each help directory (this allows
for better modularity).
<p>
We call this class an <b>overlay</b> tree to drive home the idea that each
help directory's TOC data is put into the tree, with any duplicate paths overlayed
on top of those from other help directories.
Ghidra/Framework/Help/src/main/java/help/OverlayHelpTree.java