Restore parinfer

[deas]

Migration to shadow-cljs sacrifed parinfer. We want it back.

[awb99]

We have a setting :editor (:text :parinfer).
Now with navbar we should be able to toggle quickly between edit modes.

[awb99]

parinfer can now be refactored!
the editor components are now easy to understand.

[awb99]

saite uses codemirror with paredit:
https://github.com/jsa-aerial/saite/blob/master/src/cljs/paredit_cm/core.cljs
https://github.com/jsa-aerial/saite/blob/master/src/cljs/aerial/saite/codemirror.cljs

https://github.com/jaredly/reepl/blob/master/src/reepl/code_mirror.cljs

klipse
https://github.com/viebel/klipse/blob/master/src/klipse/ui/editors/editor.cljs

https://github.com/raymcdermott/reptile-tongue
reptile also uses parinfer.