Cleaning up

It's been a thorn in my side, for a while, that I couldn't shut the engine down cleanly.  Spent a bit of time researching the issue and determined that it wasn't necessary to Assert every time an object didn't exist and it was being destroyed.  Instead, I've written them as Console warnings.  That way, a developer can still find orphaned objects or NULL objects and make sure they are cleaned up properly.  This lead to a few other issues which I was able to clean up and fix.  Now the engine shuts down as it did in v1.0 -- cleanly.  I'm a happy camper again.