[ut3] batchexport / compress / decompress commandlets

[Ryan C. Gordon]

> Is it just me or those are missing in the dedicated server?
> They'd be quite useful; especially the compress one.

They are probably part of the editor package, which means they aren't 
built into the Linux server right now.

I'll probably end up doing what I did for ut200x as a stop-gap while 
there isn't a native UnrealEd: cherry pick useful commandlets from the 
editor package.

--ryan.