removed proposal extension point contribution for refactorings

plugins/org.yakindu.sct.refactoring/plugin.xml

@@ -250,18 +250,5 @@
             class="org.yakindu.sct.refactoring.Activator">
       </startup>
    </extension>
-   <extension
-         point="org.yakindu.sct.ui.editor.proposals">
-      <ContentProposal
-            id="org.yakindu.sct.refactoring..proposal.extractdiagram"
-            label="Refactoring - Extract Subdiagram"
-            modification="org.yakindu.sct.refactoring.proposals.ExtractSubdiagramModification">
-      </ContentProposal>
-      <ContentProposal
-            id="org.yakindu.sct.refactoring..proposal.inlinediagram"
-            label="Refactoring - Inline Subdiagram"
-            modification="org.yakindu.sct.refactoring.proposals.InlineSubdiagramModification">
-      </ContentProposal>
-   </extension>
 
 </plugin>