A "unified" titlebar/toolbar

As we all know, in Leopard, most apps will adopt a "unified titlebar/toolbar."

Might be a good idea to do the same with Cog, so that it doesn't look out of place in Leopard.

While I do know that Cog doesn't have a "real toolbar," the idea is basically the same: have the upper area (everything above the playlist's "sort by" bar) be a "drag to move window" area and no line under the titlebar.