Dan Albert 747683e9e8 Allow other TGO types to be factories.
The `FactoryGroundObject` is just a special case of
`BuildingGroundObject` that we maybe don't actually need. For now it
provides some special case logic for the layout, but this allows any TGO
with the "factory" category to behave as a ground unit source.

Note that the "factory" random strike targets are *not* generated
anymore, so this doesn't affect campaign design currently.
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