Add ability for DB maintenance to delete CopiedFile events separately from SessionConnection events

Control logs the file path of all files that are copied using the Windows clipboard during a session even if the files are not transferred to the Host during the session. This is normally okay until you copy a directory that contains thousands of files -- then, logging the full file path of each file causes the database to balloon up to a potentially very large size. It would be ideal if the DB maintenance plans could have an option added to remove only the CopiedFile portion of the events so that these could be removed after a short time, while leaving the SessionConnection event in place to log X days worth of actual connections that took place.