Windows v6 beta test

[Admins]

A new version will be uploaded in a few hours, it's v5.26:
- Comes with some files packaged already (blue gui, icons)
- Command line option "-opengl" is working again, doesn't support full screen mode yet though
- Improved font rendering: all fonts except arial and verdana are now drawn with truetype hinting which is closer to the v5 font rendering
- New script variables player.diagonalwalkspeed = 0.5^0.5; and player.chatoffset = {0,-10};