Added local lights to avatar. Added haze to voxel.

Initial test values for haze distance and color, as well as light direction and color.
this appears to enable drawing of haze by default for all users... I think we want to make this a menu option. AFAICT this appears to update the haze and force a full VBO update whenever any change to the position and/or view angle is made... I think this will likely dramatically impact frame rate.