Add a batch renaming function, or allow export of a batch to another execuable.

I seem to be constantly renaming image files and currently use an extremely capable (free) utility to do this, but it would be a logical step if this function could be completed at the same time as stripping Exif data, or there was an easy way to invoke the renamer I currently use to perform its functions on the batch of images currently active in ExifCleaner