Significantly rearranged the commands

* I've eliminated all the stock building commands.  Building on Latitude
will be done exclusively with items, and some commands for assigning
areas to given 'areas' and areas to given 'regions', etc.  So the stock
commands won't be useful for any of that.  I wanted to keep them around
just for myself to use, in case it was more convenient than busting out
@py for some sort of problem.. but I decided against it.  Alternatively,
I could create some sort of command that temporarally attaches the
default built in cmdset to myself when needed.

* Now, admins have access to everything except @py

* Every @cmd style command is now in the player commandset.  Only 'game
actions' will ever be in the character only command set now.  There's no
reason to have commands which don't make sense OOC to completely
disappear when you're OOC, taking their help entries along with them,
and giving them no opportunity to explain why they're unavailable when a
user tries to invoke them, unless they're in-game actions.  (Actions, in
fact, will vary from room to room, sometimes.)

* Turned 'spoof' back into an action.  It skirts the line between being
an out of character system command, and an in character action.

* Made it so that 'ooc/@say' no longer triggers the at_say callbacks, in
case users want to communicate without triggering sound sensitive game
events, and they don't want to bust out 'page'.