Support KeeSync

[alrcatraz]

Is your feature request related to a problem? Please describe.
Now, we don't have a nice way to sync database between desktop and android, if directly read and change database in net disk like OneDrive, sometimes it will lead to file conflict.

Describe the solution you'd like
KeePassXC has a brilliant feature called KeeSync, allow programme monitoring a sync file on net disk, and only apply changes to local database. I think it will help greatly if KeePassDX support KeeSync.