read file system into playlist format and display

[sentinelweb]

• [x] Make interactor to take a directory listing and convert it to a file list in PlaylistDomain
• [x] make a hub settings screen. - replicate setting from app
  • [x] make preference to add base directories to display top level (each shows as a playlist).
• [x] scan files for video and audio types (by extension)
• [x] go up to parent in filesUi