-Corrected a minor issue with how snapping limbs closer to the player works.

-Added drag_snaplimbcloser 1. Snaps the ragdoll limb you're aiming at closer to you while dragging. Janky due to lua not being able to modify physgun scroll distance and will only work correctly with physgun models that deploy instantly with no deploy animation.

- Improved behavior of slowdown by increasing friction instead of forcing +walk.
- Also fixes being able to run very fast while dragging.
- New slowdown speed balanced according to Half Life 2's default moving speed.