now pretends gfx.wad pics are in the gfx/ directory, this changes the override path...

now pretends gfx.wad pics are in the gfx/ directory, this changes the override path for gfx.wad pics (statusbar images in other words) to be for example gfx/blah.tga, however the old override path (no prepended gfx/) is still supported for compatibility with previous versions (mainly just for sake of conchars and conback)
Sbar_Init now called from Render_Init instead of Host_Init (it was being called before the texture system was started...)
Sbar_Init now registers an sbar module, with corresponding start/shutdown/newmap functions, so when the renderer is restarted, the pics are precached again

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@2426 d7cf8633-e32d-0410-b094-e92efae38249