Parse $FSD animation events from M2 models (WotLK per-sequence arrays and
vanilla/TBC global-timeline bucketing) and trigger player/mount footsteps on
the authored foot-strike keyframes, with a synthetic gallop fallback for
models without events. Mount families now route to proper sample banks:
horse/ram hooves, kodo huge thuds, softened padded paws, and mounted water
steps get the splash treatment.
