Barcode scanner updates (#562)

* Add BUILDING.md

* Replace scaning library

- Out with qr_code_scanner
- In with flutter_zxing

* Update specs for jdk / kotlin / gradle

- NFI what this all means?

* Refactor barcode scanning widget

* Refactor barcode overlay

* Add handlers

* Update release notes

* Fix AppBar color

* Enhance attachment widget

* remove unused import

* Improved icon

* Select theme from main drawer

pubspec.yaml

@@ -27,22 +27,22 @@ dependencies:
   flutter_overlay_loader: ^2.0.0          # Overlay screen support
   flutter_speed_dial: ^6.2.0              # Speed dial / FAB implementation
   flutter_tabler_icons: ^1.35.0
+  flutter_zxing: ^1.8.2                   # Barcode scanning
   http: ^1.2.2
   image_picker: ^1.1.2                    # Select or take photos
   infinite_scroll_pagination: ^4.0.0      # Let the server do all the work!
   intl: ^0.19.0
   one_context: ^4.0.0                     # Dialogs without requiring context
   open_filex: ^4.5.0                      # Open local files
-  package_info_plus: ^8.0.2               # App information introspection
+  package_info_plus: ^8.1.1               # App information introspection
   path: ^1.9.0
   path_provider: ^2.1.3                   # Local file storage
-  qr_code_scanner: ^1.0.1                 # Barcode scanning
   sembast: ^3.6.0                         # NoSQL data storage
   sentry_flutter: 8.9.0                   # Error reporting
   url_launcher: ^6.3.0                    # Open link in system browser
 
 dev_dependencies:
-  flutter_launcher_icons: ^0.11.0
+  flutter_launcher_icons: ^0.14.1
   flutter_test:
     sdk: flutter
   lint: ^2.1.2