add setlayout function

layouts: tile and floating

Behavior's still a little wonky but positioning is there.

"root" color was easy to make configurable

introduce rules for monitor configuration

(with dwm, this would already have been done by the X server)

add spawn and termcmd

implement Button: movemouse, resizemouse

start factoring Key actions into functions

some options I like

Start with tinywl

Add a config.h into which configurables can be moved.