clean up "Add" menubar categoes on the 3d object side via the following:

SceneObject now defaults to a category of "misc"
getCategoryOfClass now checks parent classes for what categories they hold so that variants can inherit
categories are in one of a few rough groups and subgroups depending on actual mapper needs/usages

Templates/BaseGame/game/tools/worldEditor/scripts/menus.ed.tscript

@@ -472,7 +472,10 @@ function EditorGui::buildMenus(%this)
    for(%c=0; %c < getFieldCount(%enumeratedClasses); %c++)
    {
       %class = getField(%enumeratedClasses, %c);  
-      
+      //SceneObject itself is not directly spawnable
+      if (%class $= "SceneObject")
+        continue;
+        
       %category = getCategoryOfClass(%class);
 
       if(%category $= "")
@@ -480,7 +483,13 @@ function EditorGui::buildMenus(%this)
          error("Attempted to fetch category of class " @ %class @ " but none were found.");
          continue;  
       }
-      
+      //skip classes explicitly tagged not for listing (typically due to being unspawnable)
+      if(%category $= "UNLISTED")
+        continue;
+        
+      if(%category $= "MISC")
+        warn("unsorted class: "@ %class);
+        
       %parentMenu = %addMenu; //start at the top
       for(%cat=0; %cat < getFieldCount(%category); %cat++)
       {