xmobar: split xmobar config in two

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
xinitrc: start bottom xmobar instance and trayer

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
xmonad: add latest changes

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>