v0.1.5 of barcode_scanner_plugin

A powerful Flutter plugin for dual-mode barcode scanning. Supports dedicated PDA hardware via Broadcast Intents and smartphone cameras using CameraX and Google ML Kit. Changelog excerpt: - New Feature: Added Camera Frame (PreviewView) with fullscreen preview for barcode scanning. - New Feature: Added Zoom functionality via SeekBar slider and pinch-to-zoom gesture. - Improvement: Camera UI now provides interactive zoom control (0x–1x linear zoom) for better barcode detection at varying distances. - pubspec.yamlversion bump and added pub.dev topics for discoverability.