[ut2003io] Map editing

[Adam Luchjenbroers]

> I'd rather have it at icculus.org :)

If they'd host me.

I'd probably write something like a map viewer first (as practice), this would 
also provide the OpenGL viewer for the editor.

Does anybody know if UT/UT2k3 maps are compiled (like Quake1/2/3 maps, you 
write to a .map file then run a program that translates that into the format 
used ingame) or written directly?

Would be an interesting challenge.