Updating Progress Label During Long Calculation in Start

[michalis]

@Hamid

Yes, I wanted to use threads to make the animation copying faster and also keep part of the loading process happening while the loading screen is shown. I thought that since nothing was being rendered on the screen, it would not cause any problems.

For now, I will wait until the updated version is released.

For anyone who finds this thread: Note that I managed to speedup the animation copying 100x , on one thread, by 2 optimizations See this thread for details.