command stack service trial implementation

...rc/org/fortiss/tooling/kernel/internal/ActionService.java

.../fortiss/tooling/kernel/internal/CommandStackService.java

...g/fortiss/tooling/kernel/internal/ContextMenuService.java

.../tooling/kernel/internal/navigator/NavigatorViewPart.java

...rg/fortiss/tooling/kernel/internal/navigator/NewMenu.java

...c/org/fortiss/tooling/kernel/services/IActionService.java

...fortiss/tooling/kernel/services/ICommandStackService.java

.../fortiss/tooling/kernel/services/IContextMenuService.java

...rg/fortiss/tooling/kernel/util/EObjectSelectionUtils.java