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

.github/workflows/android.yaml

@@ -19,7 +19,7 @@ jobs:
       uses: actions/setup-java@v3
       with:
         distribution: 'temurin'
-        java-version: '11'
+        java-version: '17'
     - name: Setup Flutter
       uses: subosito/flutter-action@v2
       with:
@@ -29,7 +29,7 @@ jobs:
     - name: Setup Gradle
       uses: gradle/gradle-build-action@v2.4.2
       with:
-        gradle-version: 7.6
+        gradle-version: 8.5
     - name: Collect Translation Files
       run: |
         cd lib/l10n