* Don't save new note if nothing has been entered

* Fix: Always show "add item" link

Bug fixes:

* Don't accidentally delete checklist items & images when upserting note
* Checklist items don't steal focus from note title
* Correct ordering of checklist items

Optimizations & refactorings galore

Bumpo version + new build

Bumpo version

* Outsourced theming to RetainTheme!

* Dropbox sync!
* Split up SettingsViewModel into SFTP/Dropbox/Nextcloud viewmodels!