I spent a month on refactoring of engine.

It's became so big, I can not serve it in my little brain.

So I detached it into small pieces, like physics, sound,

networking, core, ai, ui, archive, prepared solid interface to

access features of engine (which will be visible for users of

engine). Also put all pieces into dll, and prepare abstract

interface for every module to clearly isolate it.

Also the thread pool (boost::threadpool) is added to execute jobs from modules.

So now engine will scale performance easily with more CPU cores.