Add QR scanner support for macOS with camera selection

- Refactor QR scanner into separate Scanner module for iOS and macOS
- Add camera selection menu for devices with multiple cameras
- Use Vision framework for QR detection on macOS
- Remove tvOS QR scanner support (continuity camera)
- Add camera entitlement and usage description for macOS
- Fix minor issues in Intents and ExtensionProvider

SFM.System/SFM.entitlements

@@ -30,5 +30,7 @@
 	<true/>
 	<key>com.apple.security.network.client</key>
 	<true/>
+	<key>com.apple.security.device.camera</key>
+	<true/>
 </dict>
 </plist>