Formations (again) and Sound FX

I re-added the flight formation code to the new version of the Trilobot's minds. I'd like to tweak it a bit so that they try to form up with nearby trilobots based on caste instead of doing it based on arbitrary number in the array, though they are grouped by caste in the array.

I also added some sound effects scoured from the web. Only a few actions have effects so far.