v1.6.0-rc.3

This release performs a database schema migration, and adds the
`BlockPullOrder`, `DisableFsync` and `MaxConcurrentWrites` folder
options to the configuration schema.

The `LocalChangeDetected` event no longer has the `action` set to
`added` for new files, instead showing `modified` for all local file
changes.

Bugfixes:

- #3876: Removing and re-adding a folder may cause data loss
- #5731: 100% CPU every minute on watch setup retry
- #6268: Out of sync panel layout overflows
- #6557: Folder error repeatedly set and unset
- #6559: Deadlock on folder unsubscribe
- #6576: Versioning params in config flip flop in order
- #6578: Allow rescan at folder state "Local Additions"
- #6583: Distributed deadlock on request
- #6604: Docker healthcheck fails when run in host network

Enhancements:

- #5224: Accept new connections in place of old ones when appropriate
- #6530: Add "Pause All"/"Resume All" button for devices
- #6541: Limit number of concurrent writes while syncing

Other issues:

- #6575: Incomprehensible error message: 'directory is not empty; files within are probably ignored on connected devices only'
- #6584: A field in a structure is sometimes protected by Mutex, but sometimes unprotected.
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