[Gtkradiant] Realtime lighting.

[Pablo Zurita]

After "wasting" around 3 months I have decided to stop my work on real-time 
lighting because I haven't been able to get good results. That doesn't mean 
that I will stop working on GtkRadiant, I will just move the focus to other 
stuff and leave the real-time lighting for the future when I get more 
knowledge on the subject, I will keep doing experiments but it wont be my 
main focus. I know people expected real-time lighting but the result of my 
code wasn't acceptable. Ok, cya.