Missing @Override annotations in javafx.graphics/src/main/java/com/sun/prism/*

Many of the classes in javafx.graphics/src/main/java/com/sun/prism are missing @Override annotations and have a few instances of using a static method on an instance of a class (as opposed to the class itself). This is always good practice but in this specific case it will help anyone trying to implement a new rendering pipeline (Vulkan, DirectX 11/12, etc.) as it makes it easier to see what methods are required to be implemented as they are used by Prism and which methods are implementation details.

I will also make the formatting of the empty traceDispose methods consistent (putting opening and closing curly brackets on same line) in the classes that are missing the annotations.