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Goober5000
156bc2c5d4
Retail has a hud_find_target_distance function that returns the distance between the player position and a bounding box. This is useful for the HUD because it shows the distance to the perimeter of an object like a jump node or a large ship. However, this function was re-used for the `distance` SEXP, resulting in the awkward situation where the distance is measured from one ship's center to another ship's bounding box. This can lead to unexpected results and it also means that the SEXP returns a different distance when the arguments are swapped. This PR deprecates the original SEXP and introduces the new SEXPs `center-distance` and `bbox-distance` which use consistent methods for both ships. It also renames the `distance-ship-subystem` SEXP to `center-distance-subsystem` and adds a new `bbox-distance-subsystem` SEXP.