GE: save recordings list to disk

[hugh2]

There are options in DVBViewer GE, both enabled by default, to save both playlist and EPG to disk when DVBViewer closes. I would argue that the list of recordings is just as important and worth saving. I'm not asking for a media library feature, just to remember the contents of the Recorder Control window between sessions. Preferably saving it after each recording is complete, just in case DVBViewer doesn't exit gracefully