[dev] [dwm] sloppy focus

Hey,

I don't know about all you, but I find dwm's sloppy focus can be
really annoying at times -- focusing a window when I accidentally
nudge my atrophying pointer -- and would rather click-to-focus. The
great thing about dropping dwm's sloppy focus is it saves 20 lines of
code! So how about we make dwm less mousy and a bit simpler, too?

Thanks,
cls