Extra attacks and chain attacks shouldnt apply on hit effects

This design for gunslingers/blademasters and volibear is just going to be a nightmare to balance items around. The bonus damage from these effects should be more than adequate to make them impactful, and having them proc on hit effects is just making them over the top. The only champion that should be able to hit multiple targets with an on hit effect is graves because his only form of attacking is already going to be hitting multiple targets.