Adds jitter for electrodes

This is essentially just to make people jitter after they're hit by electrodes from tasers and eguns.

However, the code doesn't seem to work, even though everything I've done here seems to indicate it would... I'm putting up this early to see if anyone knows what the issue might be, I'm unfamiliar with these effect handlers and stuff ?_?
This is very, very important. Add it as a ninth argument, don't stuff it in
the middle somewhere. There are no words for how miserable argument
mismatch made my life when I was working on saycode.
Op 15-dec.-2014 08:31 schreef "Remie Richards" <notifications@github.com>:

> In code/modules/mob/living/damage_procs.dm
> <https://github.com/tgstation/-tg-station/pull/6389#discussion-diff-21808810>
> :
>
> >  	updatehealth()
> >  	return 1
> >
> >
> > -/mob/living/proc/apply_effects(var/stun = 0, var/weaken = 0, var/paralyze = 0, var/irradiate = 0, var/stutter = 0, var/eyeblur = 0, var/drowsy = 0, var/blocked = 0)
> > +/mob/living/proc/apply_effects(var/stun = 0, var/weaken = 0, var/paralyze = 0, var/irradiate = 0, var/stutter = 0, var/eyeblur = 0, var/drowsy = 0, var/jitter = 0, var/blocked = 0)
>
> Before, this proc had 8 arguments, the 8th argument used as blocked,
> Blocked is now the 9th argument, did you ensure nowhere is calling this
> thinking that blocked is still the 8th?
>
> —
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> <https://github.com/tgstation/-tg-station/pull/6389/files#r21808810>.
>