Remove moving target aiming, use per-frame aiming (#7776)

Related to #7776 (closed).

This makes combat turning much smoother, similar to Morrowind.

Our actor rotation-based moving target aiming is incompatible with per-frame rotations. Morrowind doesn't have this form of moving target aiming so removing it is justified, but it rotates magic projectiles (exclusively) towards the predicted impact position. It's noticeable, but it would conflict with spellcasting (projectile) dehardcoding as that removes the involved code, so it's not included. We can have an issue for this or a todo in that.

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