STextResource exported

plugins/org.yakindu.sct.model.stext.resource/META-INF/MANIFEST.MF

@@ -17,4 +17,5 @@ Bundle-RequiredExecutionEnvironment: J2SE-1.5
 Bundle-ActivationPolicy: lazy
 Export-Package: org.yakindu.sct.model.stext.resource,
  org.yakindu.sct.model.stext.resource.factory,
+ org.yakindu.sct.model.stext.resource.impl,
  org.yakindu.sct.model.stext.resource.provider