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.

"Gar vanishes in an instant, leaving behind a fading shimmer of warped space."

"Gar vanishes in a burst of protective light!"

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 someone casts.
This eliminates the spam byproduct of hokey old 'choice' mechanisms for spells.