Icon resources page is out of date

[shastriUF]

There have been changes to NXG resources since the icons resources page was last published. Some icons have moved, and some have changed from .png to .xml. This causes confusion when people use this page as a guide to access our resources (for example, see post NXG 5.0 icons missing).

1. The page needs to be updated to conform to the latest set of resources
2. The page should also provide a code snippet (similar to what's in the post linked above) for loading the .xml-style resources -

ResourceHelpers.LoadImage(typeof(PlatformFrameworkEventSource), "SourceModel/Images/highlightExecution_16x16.xml")