moved ecore and genmodel to model directory

plugins/org.yakindu.sct.model.stext/build.properties

@@ -4,4 +4,5 @@ source.. = src/,\
 bin.includes = META-INF/,\
                .,\
                plugin.xml,\
-               libraries/
+               libraries/,\
+               model

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

@@ -41,6 +41,8 @@ Workflow {
 			// generates Java API for the generated EPackages 
 			fragment = ecore.EcoreGeneratorFragment {
 				generateEdit = true
+				genModel = "model/SText.genmodel"
+				xmiModelDirectory = "model"
 			}
 
 			// the serialization component