Grappling rework - Grappling hooks are now physics-driven (#42409)
* Grappling rework - Grappling hooks are now physics-based
* still have no idea wtf is going on with portals but fixed a few bugs + cleanup
* bonus fixes + prep for optional-but-recommended engine PR
* dropkicking a stray comment outta here
* makes the impulses actually take into account the fucking relays, makes reeling cancel if the rope's already too short, and tweaks values
* reviews + cleanup + makes ungrapple behavior a bit more consistent
joint removal was removed from ungrapple because it mispredicts either way, and breaks grappling hooks attached to the grappling gun (always good to leave possibilities like that open)
* adds a hack to work around grids not caring about waking cross-grid joints
* makes use of dirtyfield(), defenestrates magic number
* y'know it'd probably be better if we were like actually awake before we made commits