changed shader parsing to use strcasecmp just incase some shader has a weird case...

changed shader parsing to use strcasecmp just incase some shader has a weird case on the surfaceparms
made some of the q3bsp warnings use dprintf because they're probably annoying users
switched to simpler tracebrush bsp recursion code (the old code crashed for me occasionally, but I've been unable to reproduce that problem again, so I guess it's fixed too, or something)

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@3881 d7cf8633-e32d-0410-b094-e92efae38249