Feature Request: Integrate webdav sync

[funky-monkey]

First off - still loving the app! Most (self hosted) sync solutions also have support for/with webdav (It's basically mounting a folder on a server, to your app). There are a couple of OSS lib's out there for both Obj-C and Swift that support this. (ConnectionKit, DAVKit) If webdav would be integrated syncing is not bound to only Dropbox.

Would love to see this in Dringend :)

Cheers, Sidney