feat: add support for parent styles and style items in grammarcell cells

Author: Alexander Pann

code/grammarcells/languages/com.mbeddr.mpsutil.grammarcells.sandboxlang/models/com/mbeddr/mpsutil/grammarcells/sandboxlang/editor.mps

@@ -73,6 +73,9 @@
       </concept>
       <concept id="1186414860679" name="jetbrains.mps.lang.editor.structure.EditableStyleClassItem" flags="ln" index="VPxyj" />
       <concept id="1186414928363" name="jetbrains.mps.lang.editor.structure.SelectableStyleSheetItem" flags="ln" index="VPM3Z" />
+      <concept id="1186414999511" name="jetbrains.mps.lang.editor.structure.UnderlinedStyleClassItem" flags="ln" index="VQ3r3">
+        <child id="1221219051630" name="query" index="1mkY_M" />
+      </concept>
       <concept id="1630016958697718209" name="jetbrains.mps.lang.editor.structure.IMenuReference_Default" flags="ngI" index="2Z_bC8">
         <reference id="1630016958698373342" name="concept" index="2ZyFGn" />
       </concept>
@@ -82,6 +85,7 @@
       </concept>
       <concept id="1233758997495" name="jetbrains.mps.lang.editor.structure.PunctuationLeftStyleClassItem" flags="ln" index="11L4FC" />
       <concept id="1233759184865" name="jetbrains.mps.lang.editor.structure.PunctuationRightStyleClassItem" flags="ln" index="11LMrY" />
+      <concept id="1221062700015" name="jetbrains.mps.lang.editor.structure.QueryFunction_Underlined" flags="in" index="1d0yFN" />
       <concept id="5266818545798688928" name="jetbrains.mps.lang.editor.structure.ShowBoundariesInStyleClassItem" flags="lg" index="1fO$WK" />
       <concept id="5692353713941573329" name="jetbrains.mps.lang.editor.structure.QueryFunction_TransformationMenu_ActionLabelText" flags="ig" index="1hCUdq" />
       <concept id="1088013125922" name="jetbrains.mps.lang.editor.structure.CellModel_RefCell" flags="sg" stub="730538219795941030" index="1iCGBv">
@@ -1046,6 +1050,17 @@
               </node>
             </node>
           </node>
+          <node concept="VQ3r3" id="7sG71xJu8KK" role="3F10Kt">
+            <node concept="1d0yFN" id="7sG71xJu8NK" role="1mkY_M">
+              <node concept="3clFbS" id="7sG71xJu8NL" role="2VODD2">
+                <node concept="3clFbF" id="7sG71xJu8Ou" role="3cqZAp">
+                  <node concept="3clFbT" id="7sG71xJu8Ot" role="3clFbG">
+                    <property role="3clFbU" value="true" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
         </node>
         <node concept="3F0ifn" id="RbLMy6d5WL" role="3EZMnx">
           <property role="3F0ifm" value="[]" />