Split from D1473 since that has become controversial with the addition of SelectionGroupNames for siege engines which is not really related. Since most of the discussion in D1473 was about SelectionGroupNames, I'll keep D1473 for the SelectionGroupName related changes and make this new one for the original uncontroversial fix.

Packed ptolemy catapults previously unpacked to macedonian catapults. Also, unpacked ptolemy catapults packed to macedonian catapults. This created a minor gameplay problem where double clicking your packed catapults as ptolemy would not select all of them, because the catapults that had already been unpacked and packed had a different template from those that were never unpacked.

Produce a catapult as ptolemy, unpack it, verify that it still functions as it should, and pack it again. Using the developer overlay, view the template of the catapult to see that it is a ptolemy catapult and not a macedonian one.