pre4: kdbx4-support compatible with Keepass 2.35
Reimplemented WebDav file storage, now allows file browsing and supports modern encryption.
Reimpleented FTP file storage, now allows file browsing and supports encryption (FTPS).
Updated to OneDrive SDK (previously used Live SDK is no longer updated)
Updated to Dropbox SDK v2 (previously v1 SDK is deprecated).
added preview-support for the new KDBX-4-format including Argon2 key derivation and ChaCha20 encryption. This is for TESTING ONLY!