* More sanity checking when enabling sRGB pipeline, to ensure its actually supported before calling any sRGB related functions. Also provide more log messages if something is odd or goes wrong.
 * Remove the sanity check from TextureUtil since it is now done once during initialization of the renderer.
 * If LwjglRenderer.VALIDATE_SHADER is enabled, log shader compilation warnings as Level.WARNING instead of Level.FINE. Also slightly better grammar in shader compile / link messages.