Bind occlusion culling toggle to ctrl alt shift o

indra/newview/skins/default/xui/en/menu_viewer.xml

@@ -3673,7 +3673,9 @@ function="World.EnvPreset"
             </menu_item_check>
             <menu_item_check
              label="Object-Object Occlusion"
-             name="Object-Object Occlusion">
+             name="Object-Object Occlusion"
+             shortcut="control|alt|shift|o"
+             use_mac_ctrl="true">
                 <menu_item_check.on_check
                  function="CheckControl"
                  parameter="UseOcclusion" />