Support for XvT/BoP

[rdoeffinger]

These are patches that allow it to work quite a bit in these older games. However I would very much like you to review it and possibly help out with a few things. Biggest issue: I removed the memset(buffer, 0x80, ...) that I later realized is necessary for some colorkey support. I didn't find a way to make it work without that, and I didn't find what removing that breaks. Other issues, in order of priority, in case you have some hints/ideas:

• There is a crash on leaving 3D mode. I haven't been able to get a useful backtrace on that. Possibly wild function pointers?
• The image in the CMD/HUD is offset, the 3D models appear in the lower half (though at full scale) instead of centered.
• The movies play wrong, looks like16 bit rendered onto a 32 bit surface.

Any comments/help welcome.

[rdoeffinger]

Updated version. I haven't squashed bugfix commits with the earlier changes they relate to, please tell me if you'd like me to that kind of cleanup. Everything except the movies now seems to work reasonably.

[rdoeffinger]

This is no longer useful I think. Thanks for starting this project.