Test Vehicle Release

This release just adds the Encrypted Folders with WebDAV backends in the version available for use with local folders, which ignores the meta data files and directly accesses each file to get the unencrypted information for comparison back.

Of course this consumes quite a lot of time, so it is only intended as a test vehicle to check if everything mentioned in the meta data files is really present. During slow transfers, with flaky networks, or backends which cannot deal with the strange encrypted file names JFileSync3 uses, I'm sometimes not sure if everything works well.