add 'Object Class' column to PropertyListPanel

Content/UniversalEditor.Content.PlatformIndependent/Panels/PropertyList/PropertyListPanel.glade

@@ -6,6 +6,8 @@
     <columns>
       <!-- column-name colObjectName -->
       <column type="gchararray"/>
+      <!-- column-name colObjectClass -->
+      <column type="gchararray"/>
     </columns>
   </object>
   <object class="GtkTreeStore" id="tmProperties">
@@ -37,6 +39,12 @@
                 <attribute name="text">0</attribute>
               </attributes>
             </child>
+            <child>
+              <object class="GtkCellRendererText"/>
+              <attributes>
+                <attribute name="text">1</attribute>
+              </attributes>
+            </child>
           </object>
           <packing>
             <property name="expand">False</property>