Enable PiP on Native Player (#786)

Swiftfin/Info.plist

@@ -63,6 +63,10 @@ network.</string>
 	</dict>
 	<key>UIApplicationSupportsIndirectInputEvents</key>
 	<true/>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>audio</string>
+	</array>
 	<key>UIFileSharingEnabled</key>
 	<true/>
 	<key>UILaunchScreen</key>

Swiftfin/Views/VideoPlayer/NativeVideoPlayer.swift

@@ -73,6 +73,9 @@ class UINativeVideoPlayerViewController: AVPlayerViewController {
         newPlayer.appliesMediaSelectionCriteriaAutomatically = false
         newPlayer.currentItem?.externalMetadata = createMetadata()
 
+        // enable pip
+        allowsPictureInPicturePlayback = true
+
         rateObserver = newPlayer.observe(\.rate, options: .new) { _, change in
             guard let newValue = change.newValue else { return }