Save screenshots & movie to client or server

Currently, images and animations are saved on the client side when running ParaView in client-server mode. In some situations, this is inconvenient. For example, when the client is running on a "thin client" computer, there may be limited space to save large movies or image sequences. Or the user may perform their main workflow on the server side, requiring them to upload the images or movies later. It should be possible to save these on either the client or the server side. The file browser should let the user browse both sides (possibly through the folder dropdown where the top level is the machine) and allow to save on either.