* Removed a bit of dead legacy code
* Fixed entity references during spawning
Entities that had references to other entities that hadn't been spawned yet weren't getting their IDs remapped correctly, since the new ID wasn't available yet. By pre-generating the full set of IDs, the references now remap correctly.
* Fixed up Entity References to work across multiple SpawnEntities calls
With SpawnEntities, entity references need to forward-reference to the *first* entity spawned, then from that point on backwards-reference to the *last* entity spawned. Added that logic, along with some initial unit tests for SpawnAllEntities.
* Added more unit tests for SpawnEntities / SpawnAllEntities
Mike Balfour
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