Trance words silenced

Other players will no longer hear you interacting with your own spell
for:

- Elusion
- Morph
- Illusionary Form
- Create Weapon
- Distill

In addition, Elusion and Rescue now give a message to the room when you
disappear, just to clarify what happened.

This means you can Elusion to a city (or, especially, your guildhall) without
players knowing where you went - since people are already doing this anyway
with weird text tricks, I figured why not make it official.

The real purpose of this change: it's super, super annoying to constantly
see chat spam from people making potions, creating weapons, imping
morph, and whatever else requires spoken words every time one casts.