Applies friction scale (icyness) to actors.

area_start_active: active without an ON active in-pin
icyness: 0% - 100% (100 is no friction whatsoever)
falloff_dist: distance at which icyness falls to zero (0 for no falloff)

active: turns icyness ON/OFF
multiplier: applies an analog multiplier to icyness (0%-100%)

