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

lib/widget/attachment_widget.dart

@@ -208,11 +208,8 @@ class _AttachmentWidgetState extends RefreshableState<AttachmentWidget> {
 
     if (tiles.isEmpty) {
       tiles.add(ListTile(
+        leading: Icon(TablerIcons.file_x, color: COLOR_WARNING),
         title: Text(L10().attachmentNone),
-        subtitle: Text(
-          L10().attachmentNoneDetail,
-          style: TextStyle(fontStyle: FontStyle.italic),
-        ),
       ));
     }
 

lib/widget/drawer.dart

@@ -1,3 +1,4 @@
+import "package:adaptive_theme/adaptive_theme.dart";
 import "package:flutter/material.dart";
 import "package:flutter_tabler_icons/flutter_tabler_icons.dart";
 
@@ -185,6 +186,28 @@ class InvenTreeDrawer extends StatelessWidget {
       )
     );
 
+    tiles.add(Divider());
+
+    bool darkMode = AdaptiveTheme.of(context).mode.isDark;
+
+    tiles.add(
+      ListTile(
+        onTap: () {
+          AdaptiveTheme.of(context).toggleThemeMode();
+          _closeDrawer();
+        },
+        title: Text(L10().colorScheme),
+        subtitle: Text(L10().colorSchemeDetail),
+        leading: Icon(
+          TablerIcons.sun_moon,
+          color: COLOR_ACTION
+        ),
+        trailing: Icon(
+          darkMode ? TablerIcons.moon : TablerIcons.sun,
+        )
+      )
+    );
+
     tiles.add(
       ListTile(
         title: Text(L10().settings),

lib/widget/refreshable_state.dart

@@ -101,7 +101,7 @@ mixin BaseWidgetProperties {
         },
       ),
       IconButton(
-        icon: Icon(Icons.barcode_reader, color: COLOR_ACTION),
+        icon: Icon(TablerIcons.barcode, color: COLOR_ACTION),
         iconSize: iconSize,
         onPressed: () {
           if (InvenTreeAPI().checkConnection()) {