Update Requirements (#541)

* Update package requiremenst

* github workflow updates

* ios build updates

* Theme adjustments

* Further updates

* Fix typo

* Deprecated imperative apply of Flutter's Gradle plugins

Ref: https://docs.flutter.dev/release/breaking-changes/flutter-gradle-plugin-apply

* Refactor wedge scanner

* Add context checks

* Adjust behaviour if testing

* Further refactoring

* Moar checks

* Logic fix

* Fix for wedge scanner test

* Fix for barcode processing

* Fix

* Yet another fix

test/wedge_scanner_test.dart

@@ -21,7 +21,7 @@ void main() {
     await simulateKeyDownEvent(LogicalKeyboardKey.keyA);
     await simulateKeyDownEvent(LogicalKeyboardKey.keyB);
     await simulateKeyDownEvent(LogicalKeyboardKey.keyC);
-    await simulateKeyDownEvent(LogicalKeyboardKey.enter);
+    await simulateKeyDownEvent(LogicalKeyboardKey.enter, character: "\n");
 
     // Check debug output
     debugContains("scanned: abc");