The effect flag EF_INVLIGHT causes MDLs to be lit from the ceiling, instead of from the floor. zhlt_copylight doesn't currently understand this.

What I propose is that if any of these criteria are met, the light from zhlt_copylight's target is copied to the ceiling instead of the floor.

• New KV zhlt_copylight_inverted is 1
• effects KV contains bitflag 16
• Classname is monster_barnacle
• Classname is monster_turret, monster_miniturret, or monster_sentry, and orientation KV is 1