Unpack language projects for xpand tooling (YAKHMI-599)

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

@@ -20,3 +20,4 @@ Require-Bundle: org.eclipse.core.runtime,
  org.eclipse.xtext,
  org.yakindu.sct.model.stext
 Bundle-ActivationPolicy: lazy
+Eclipse-BundleShape: dir

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

@@ -20,3 +20,4 @@ Require-Bundle: org.eclipse.core.runtime,
  org.eclipse.gmf.runtime.emf.core,
  org.yakindu.base.types;visibility:=reexport
 Bundle-ActivationPolicy: lazy
+Eclipse-BundleShape: dir

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

@@ -42,4 +42,4 @@ Export-Package: org.yakindu.sct.model.stext,
  org.yakindu.sct.model.stext.stext.impl,
  org.yakindu.sct.model.stext.stext.util,
  org.yakindu.sct.model.stext.validation
-
+Eclipse-BundleShape: dir