Marker for a constant representing a static resource.
The annotated field must be a compile-time String constant whose value denotes a resource path.
For example, the resource might be an icon path intended for ImageUtilities.loadImage.
The primary purpose of the annotation is for its processor, which will signal a compile-time error
if the resource does not in fact exist - ensuring that at least this usage will not be accidentally
broken by moving, renaming, or deleting the resource.