Version 1.7 BETA 4

4th beta is here. As I said, I tried to optimize rendering and other drawing stuff, especially in OpenGL and Direct3D. All the stuff that slowed down OpenGL and Direct3D was removed. I also improved glBSP utility to correctly recognize sectors with polyobjs and to avoid to split them as whell some other bugfixes and improvements. Read file glbsp_jl.txt for list of all changes. I also created a little launcher for Windows version.