Fix stackoverflow caused by new table.copy

modules/corelib/table.lua

@@ -14,10 +14,18 @@ function table.dump(t, depth)
 end
 
 function table.copy(t)
+  local res = {}
+  for k,v in pairs(t) do
+    res[k] = v
+  end
+  return res
+end
+
+function table.recursivecopy(t)
   local res = {}
   for k,v in pairs(t) do
     if type(v) == "table" then
-      res[k] = table.copy(v)
+      res[k] = table.recursivecopy(v)
     else
       res[k] = v
     end
@@ -83,4 +91,4 @@ function table.empty(t)
     return next(t) == nil
   end
   return true
-end
+end