Rework the events coming from the editor.
Rework the events coming from the editor.

Remove handlers for editarea events now that they'll never be fired,
and separate handling of changes in the editors content from keyboard
shortcuts. This fixes handling of the modifications marker, as well
as the autosave triggers.

jmorse/cyanide,jmorse/cyanide,jmorse/cyanide,jmorse/cyanide