* ability to mark an open document as unsaved
* unsaved detection now being triggered based on layer tree height
* - rust implementation of unsaved markers
- upgraded eslint
* updated eslint in package.json
* - Renamed GetOpenDocumentsList -> UpdateOpenDocumentsList
- is not -> was not
* changed hash to current identifier to better reflect its meaning
* resolve some merge conflicts
* removed console.log statement leftover from debuging
