Updated README for clarity
Refactored to include YWS class prefix
Remove the Cancel button for clarity; changed the QR code image view content mode to center
Simplified the QR code generation logic
Tidied up the scanner a bit
Made YWSReadViewController's conformance to AVCaptureMetadataOutputObjectsDelegate more explicit
Clarified bar code reading logic; extracted barcode highlight view, and ensured UI updates occur on the main thread.