recompile and restart!

The binding Meta-Ctl-Esc has been added to enable recompile and restart
direct from inside RWind, much like what xmonad does.
This should allow for quite simpler development and testing.
Clean up user script file

Move and resize window now use the Alt/Meta key.
Added focus-next! binding.
Added quit and recompile/restart bindings.
My own config file now requires simple.rkt, which should avoid some discrepancies.