use depsgraph to ensure modifiers of objects referenced are considered

At the moment, you add a curve, you shrinkwrap the curve to an object, and then you have something follow the curve. The something that follows the curve still thinks it's in it's unshrunk state.

Would be great if a few smarts could be added so that objects reliant on other objects, consider them in their final state (post modifiers). Otherwise you have to apply modifiers, which reduces ease of future editability.