Game Engine v0.97pre4

New features:

1. GDI.drv: Added "Map to halftone" color reduction mode (doesn't seem to work in Win32s).
2. GDI.drv: Added quick DIB mapping mode (doesn't work for now, dunno why).

P.S. I'm really sorry for such long delay. But I just hate to do things blindly. As you know, palette is extremely terribly documented. So initially I wanted to add lots of options to test many different configurations and allow user to choose the quickest one. But I had doubts about certain functionality. If my suspicions would have been true, all my work would been pointless. I would have invested lots of effort into something, that wouldn't have worked as I expected anyway. So I decided to try different approach. To investigate things first. It had taken lot of time. And yeah. I was right about my suspicions. All I needed to do - to change things. Good? Nope. First of all I became busy IRL and couldn't focus on solving this problem. Second - I had to choose between implementing only needed things and making complete implementation, that would have overcomplicated things too much. It had taken lots of time to make this decision. Third - I still had doubts about options. As I already knew, how things actually worked, I could make options much more simple. Like implementing just 4 modes for example: super quick, quick, normal, slow. But at the same time new variants were subsets of already existing options, so I could leave things as is and just add some new features. So, for now I decided not to change things too much and try to implement things on a top of already existing code.