Kernel: JavaFX editor. Rework base classes after review.

...ase.ui/src/org/fortiss/tooling/base/ui/editor/fx/.ratings

...rg/fortiss/tooling/base/ui/editor/fx/ContextMenuUtil.java

.../base/ui/editor/fx/EObjectBasedDiagramControllerBase.java

...ObjectBasedRectangularResizableContentControllerBase.java

.../editor/fx/HierarchicModelElementModelChangeProvider.java

.../editor/fx/KernelServiceBasedModelChangeProviderBase.java

...e/ui/editor/fx/LayoutModelElementModelChangeProvider.java

.../LayoutedModelElementBasedContentAnchorageController.java

.../LayoutedModelElementBasedDiagramAnchorageController.java

.../fx/LayoutedModelElementBasedLinkBendPointController.java

....tooling.base/src/org/fortiss/tooling/base/utils/.ratings

...g.eclipse.systemfocus.kernel.common.ui_0.0.4.20191111.jar