Multithreaded

Moved world generation to another tread. So, loading graphics is the only problem that freezes game at start.

But when this graphics loading and processing became alone, it is no more that troubling at game start.
I have to optimize it. In future, of course.  But right now, program start doesn't look that frozen. =)
Also, Multithreading looks to be useful tool. I think, I'll use it fir different heavy calculations, like NPC pathfinding and so on.