the gradient color array, it observs the gradient for
this purpose
* introduced IconObject class that combines Observable,
Referenceable and Selectable interfaces and adds an
interface for retrieving a PropertyObject that represents
the object in question
* Shape and Style inherit from IconObject now
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18037 a95241bf-73f2-0310-859d-f6bbb57e9c96