GenModels: Use Java Level 8.0

Issue-Ref: 3376
Signed-off-by: Simon Barner <barner@fortiss.org>

org.fortiss.tooling.base/model/base.genmodel

@@ -4,7 +4,7 @@
     modelDirectory="/org.fortiss.tooling.base/generated-src" editDirectory="/org.fortiss.tooling.base.edit/generated-src"
     editorDirectory="/org.fortiss.tooling.base.editor/generated-src" modelPluginID="org.fortiss.tooling.base"
     modelName="Base" importerID="org.eclipse.emf.importer.ecore" containmentProxies="true"
-    complianceLevel="6.0" copyrightFields="false" usedGenPackages="platform:/resource/org.fortiss.tooling.kernel/model/kernel.genmodel#//model">
+    complianceLevel="8.0" copyrightFields="false" usedGenPackages="platform:/resource/org.fortiss.tooling.kernel/model/kernel.genmodel#//model">
   <foreignModel>base.ecore</foreignModel>
   <genPackages prefix="Base" basePackage="org.fortiss.tooling.base" disposableProviderFactory="true"
       ecorePackage="base.ecore#/">

org.fortiss.tooling.graphicsGL/model/graphics3D.genmodel

@@ -3,7 +3,7 @@
     xmlns:genmodel="http://www.eclipse.org/emf/2002/GenModel" copyrightText="(c) 2017 fortiss GmbH. GENERATED CODE: Do not edit, see Ecore metamodel instead!"
     modelDirectory="/org.fortiss.tooling.graphicsGL/generated-src" editorDirectory="/org.fortiss.tooling.graphicsGL.editor/src"
     modelPluginID="org.fortiss.tooling.graphicsGL" modelName="Model" modelPluginClass=""
-    importerID="org.eclipse.emf.importer.ecore" containmentProxies="true" complianceLevel="6.0"
+    importerID="org.eclipse.emf.importer.ecore" containmentProxies="true" complianceLevel="8.0"
     copyrightFields="false" editorPluginID="org.fortiss.tooling.graphicsGL.editor"
     usedGenPackages="platform:/resource/org.fortiss.tooling.kernel/model/kernel.genmodel#//model">
   <foreignModel>graphics3D.ecore</foreignModel>

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

@@ -6,7 +6,7 @@
     modelName="Model" modelPluginClass="" editPluginClass="org.fortiss.tooling.kernel.model.provider.ModelEditPlugin"
     editorPluginClass="org.fortiss.tooling.kernel.model.presentation.ModelEditorPlugin"
     testsDirectory="/org.fortiss.tooling.kernel.tests/test-src" importerID="org.eclipse.emf.importer.ecore"
-    containmentProxies="true" complianceLevel="6.0" copyrightFields="false">
+    containmentProxies="true" complianceLevel="8.0" copyrightFields="false">
   <foreignModel>kernel.ecore</foreignModel>
   <genPackages prefix="FortissToolingKernel" basePackage="org.fortiss.tooling.kernel"
       disposableProviderFactory="true" ecorePackage="kernel.ecore#/">