Do not merge. Prototype for icons

Creation of prototype that loads icons from XML documentation file generated by project.

@Benglin, please review this prototype. Pay attention on CoreNodes project and classes Color and Files. Images should appear in old tooltip.
Hi Anna, I guess we don't want to include ```iconSmall``` and ```iconLarge``` in the XML header. The library tool-tip (or any relevant data) can always use the class's fully qualified name (e.g. ```DSCore.Color``` and ```DSCore.Color.Red```) to locate the icon resources in the satellite DLL. Does that make sense?