Removed unnecessary ECore model and replaced it with simple Java implementation.

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

...tiss/tooling/kernel/ui/extension/data/TutorialStepUI.java

...ernel/ui/internal/views/NavigatorTreeContentProvider.java

.../kernel/ui/internal/views/NavigatorTreeContentSorter.java

...s/tooling/kernel/ui/internal/views/NavigatorViewPart.java

...entation/TutorialDefinitionModelElementLabelProvider.java

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

org.fortiss.tooling.kernel/trunk/model/kernel.ecore

org.fortiss.tooling.kernel/trunk/model/kernel.genmodel

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

...g/fortiss/tooling/kernel/extension/ITutorialProvider.java

...iss/tooling/kernel/extension/data/TutorialDefinition.java

...g/fortiss/tooling/kernel/extension/data/TutorialStep.java