VideoTSParent nfo/jpg handling

Handle nfo/jpg files in the VIDEO_TS or BDMV parent directory if
VideoTSParent is true. Only in Settings.xml now, will expose later.

It appears bodrick started on this but removed the exposure of the setting and didn't get to saving the filenames based on what the user had specified in settings (for example fanart.jpg vs -fanart.jpg), or he was assuming that if the user wanted the files in the parent directory that they should be named after it. Either way, frodo seems to only detect fanart.jpg in the parent so this option starts to give the user the needed control.

The user can manually set the setting until I can get it added to the GUI and we have more input that this is the right direction.