Reagent stuff

Created by: clusterfack

Fix #7482 (closed) I expect fixes #7479 (closed)

Since these reaction procs were spawned off reagents clear was being called BEFORE the reagents were reacting.

This sets waitfor = 0 for these procs so that they will automatically spawn off instead of delaying the reaction if sleep() is used in them, but still let's them react before clear_reagents is called.