Retro Ports: Alien 8

I've done a bit more reverse-engineering on Alien 8 and there's no surprises so far. There are less sprites but (seemingly) more code so I expect the objects have more complex behaviour. That aside, a lot of the routines are either identical, or very close. And a lot of the variables are the same too.

It should only take a few days to get all the "generic" code identified and bashed into shape for relocation; longer if I were to comment every aspect like Knight Lore.

And just because it only took 2 mins...