[xmonad] darcs patch: Port XPrompt to XMonad.Util.Font, various other refact...

This patch adds Xft support to XMonad.Prompt. I'd like Clemens and Andrea to check this out before we push it to the main repository. Fri Nov 16 17:27:43 CST 2007 Spencer Janssen * Port XPrompt to XMonad.Util.Font, various other refactorings