*Fixed OpenGL's handling of cv_translucency effects (should not remove shadows...

*Fixed OpenGL's handling of cv_translucency effects (should not remove shadows if off, but perhaps make them use default alpha?), someone was a bit hasty! *De-stupified the MD2 status checks regarding drawing of sprites - if they're already checked before calling HWR_DrawSprite, there's no point doing them WITHIN the function as well *Split off sprite shadow code into HWR_DrawSpriteShadow for convenience

git-svn-id: https://code.orospakr.ca/svn/srb2/trunk@8983 6de4a73c-47e2-0310-b8c1-93d6ecd3f8cd