fileservice/action: Refactored broken clipboard. Now cut/copy/paste is handled primarily on the client. The client keeps track of all files on clipboard in the browser cookie. The server now just has a "paste" command (or rather, copy and move commands). action_cut and action_copy removed. action_paste changed to take more arguments and no longer access session. All information from the clipboard is explicitly expected as arguments.
NOTE: The client side of this does not yet work, only the server is working (and tested).