Changes to defaults

- Don’t use System Controls with AVPlayer by default
- Changed default order of the formats
- no default AVPlayer profiles except for tvOS
- new constants isIOS, isTvOS, isMacOS
- ArtWork for nowPlaying is .medium on iPhone .maxres on all other platforms
- changes to the player bar defaults

Signed-off-by: Toni Förster <toni.foerster@gmail.com>

Shared/Settings/QualityProfileForm.swift

@@ -301,7 +301,7 @@ struct QualityProfileForm: View {
     func isFormatDisabled(_ format: QualityProfile.Format) -> Bool {
         guard backend == .appleAVPlayer else { return false }
 
-        let avPlayerFormats = [QualityProfile.Format.hls, .stream, .mp4]
+        let avPlayerFormats = [.mp4, .stream, QualityProfile.Format.hls]
 
         return !avPlayerFormats.contains(format)
     }