Redo of jitteriness and dizziness.

Fixes #2923
Replaces make_jittery() and make_dizzy() with Jitter() and Dizzy(). To go with Stun() Paralyze() etc.

I removed some spawn() emote() type stuff, but in hindsight I'm thinking maybe those were supposed to be there. Agh whatever. 

Pic of jittery: http://imgur.com/4YN8zV0
For dizziness imagine the screen shaking somewhat every second or so. There you go. High values are crazy, don't get drunk kids.