implemented model element handler service and part of navigator view

org.fortiss.tooling.kernel/trunk/META-INF/MANIFEST.MF

org.fortiss.tooling.kernel/trunk/icons/project.png

org.fortiss.tooling.kernel/trunk/icons/unknown.png

org.fortiss.tooling.kernel/trunk/plugin.xml

...tiss.tooling.kernel/trunk/schema/modelElementHandler.exsd

...rc/org/fortiss/tooling/kernel/ToolingKernelActivator.java

.../fortiss/tooling/kernel/base/ModelElementHandlerBase.java

...rtiss/tooling/kernel/interfaces/IModelElementHandler.java

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

...rg/fortiss/tooling/kernel/internal/CompositorService.java

...org/fortiss/tooling/kernel/internal/ConnectorService.java

...rg/fortiss/tooling/kernel/internal/ConstraintService.java

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

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

...org/fortiss/tooling/kernel/internal/ExecutionService.java

...c/org/fortiss/tooling/kernel/internal/LibraryService.java

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

.../fortiss/tooling/kernel/internal/ModelElementService.java

...org/fortiss/tooling/kernel/internal/MultiUserService.java

...org/fortiss/tooling/kernel/internal/NavigatorService.java