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.
There's a general indentation problem here, and the lines are getting too long. Again, it will be helpful to install ```Editor Guidelines``` as I recommended so the problem becomes more obvious.

1. This ```if``` statement has a large body, and whenever there are more than one line for the condition, we will have to use open/close curly brackets.
2. If we change this to ```if (string.IsNullOrEmpty(member.Assembly)) return;``` then we can reduce the indentation for the rest of the method.