-Moved the define-handler mini-language out into its own file (this halved util.lisp)
-Added with-table-lock to a couple of handlers that really should have had it already
-Debating a second type of handler that automatically does the with-table-lock thing, and does an extra assertion (that the current player has a session, and that session clears them to play at the named table)
-Forgot to check in define-handler.lisp