Editor: Updates go through wonky state

[dmsnell]

Right now edits are a bit awkward in the editor. Changes are debounced (to around 3s I think) before updating to Simperium but this can present an unexpected feedback loop in the app:

1. Make a change in the editor
2. Change synchronizes
3. Change comes back and edits editor content

This may be behind the occasional runaway infinite loop in #635 and some glitchy editing behavior in #568.

cc: @roundhill

[mirka]

I think this is fixed in #1193.