Changed emf runtime version to 2.8

plugins/org.yakindu.sct.generator.genmodel/src/org/yakindu/sct/generator/genmodel/GenerateSGen.mwe2

@@ -40,6 +40,7 @@ Workflow {
 
             // generates Java API for the generated EPackages
             fragment = ecore.EcoreGeneratorFragment {
+            	emfRuntimeVersion = "2.8"
             // referencedGenModels = "
             //  platform:/resource/org.eclipse.xtext.xbase/model/Xbase.genmodel,
             //  platform:/resource/org.eclipse.xtext.common.types/model/JavaVMTypes.genmodel

plugins/org.yakindu.sct.model.stext/src/org/yakindu/sct/model/stext/GenerateExpressions.mwe2

@@ -48,6 +48,7 @@ Workflow {
 			fragment = ecore.EcoreGeneratorFragment {
 				generateEdit = true
 				genModel = "model/SText.genmodel"
+				emfRuntimeVersion = "2.8"
 				xmiModelDirectory = "${runtimeProject}/model"
 			}
 

plugins/org.yakindu.sct.model.stext/src/org/yakindu/sct/model/stext/GenerateExpressionsRuntimeOnly.mwe2

@@ -48,6 +48,7 @@ Workflow {
 			fragment = ecore.EcoreGeneratorFragment {
 //				generateEdit = true
 				genModel = "model/SText.genmodel"
+				emfRuntimeVersion = "2.8"
 				xmiModelDirectory = "${runtimeProject}/model"
 			}