public Set<DecompilerHighlighter> getServiceHighlighters() {
		return userHighlights.getServiceHighlighters();
	}
Returns all highlight service highlighters installed in this controller.  The global
highlighters apply to all functions.  This is in contrast to secondary highlighters, which 
are function-specific.
@return the highlighters
Ghidra/Features/Decompiler/src/main/java/ghidra/app/decompiler/component/ClangHighlightController.java