Universal URIs ("links") for all clients

A link-like string that identifies an arbitrary file or directory in a library, clients on all platforms should accept this link and take the user to the node it points to (the desktop clients should ask the user if they want to open the object on seahub, sedrive or to the filesystem if that object is synchronized; on android it should open the seafile app on the item). This should identify the library using its ID, so that any user that has access to the library can use the link.

If seafile had this, it would be so much easier to send files between mobile and desktop. Right now it’s impossible to do this without using seahub on mobile.