Some details about indentation

As you ask in #2

I think the screenshots below are a good representation of the current work of the indentation plugin. In each case I just start a new line with "o" in the normal mode.


Here is a code snippet to reproduce the problem:
```yuck
(defwindow bar
:monitor 0
:geometry (geometry :x "0%"
:y "20px"
;:width "90%"
:height "1070px"
:anchor "right center")
:exclusive true
:stacking "fg"
"example content")

(defwidget bar [screen]
(centerbox
:orientation "h"
:class "bar"
(eventbox
:onscroll "swaymsg workspace $([[ {} = 'up' ]] && echo 'prev' || echo 'next')"
(box :halign "start"
:space-evenly false
(workspaces)
(mode)
(window)))
(box :halign "center"
:hexpand true
:space-evenly false
(disk)
(ram)
(cpu)
(temp)
(pkg)
(network))
(box :halign "end"
:hexpand true
:space-evenly false
(music)
(volume)
(time))))
```