Restore key sources

When Quick Unlock fails to open the database, the actual key sources are restored.
As a consequence, all fields in the key prompt form are checked as if the database would be opened without Quick Unlock being installed.

Lock workspace

Allow to lock / unlock ALL databases or only the selected one

Add support of other key providers to Quick Unlock

Add timeout option to Quick Unlock

Bugfix

Ensure Quick Unlock PIN always works

Release LockAssists

Initial commit
Quick Unlock is usable