GRIM: If ActorLookAt is called with an actor as the target, look towards the actor's head instead of their origin. Fixes #887
GRIM: Do not truncate SetGamma parameter decimals.
GRIM: Lua Print(Debug|Warning|Error) caller provides newline.
GRIM: Make lua Print(Error|Warning) use consistent debug channels.
GRIM: Use GLfloat instead of float when passed to gl* functions.
GRIM: Disable GL_LIGHT0's default specular component.
GRIM: Replace intensity divisor with attenuation.