Cyanide Poison Reminder

Talk about half a job... I'd added thrown weapon poison monitoring along with a switch in the mod options to enable/disable it. However, I didn't get around to checking the status of that switch before showing the alert, so it was not actually doing anything at all. This is now fixed, so this should finally be stable and working for Cata.

I'll be playing in MOP and will keep this mod running, but the code will need a tweak.  From memory poisons will work as a player buff rather than a weapon buff. Sadly this means we will no longer be able to weapon-swap for shivving mind numbing, but poisons will still have a timer.