Stock display (#379)

* Display stock quantity more prominently

* Cleanup search widget

* Update for stock_detail widget

* More tweaks

* Change bottom bar icon

* Display boolean parameters appropriately

* Adds ability to edit part parameters

* Bump icon size a bit

* Improvements to filter options

- Allow filtering by "option" type
- To start with, filter stock by status code

* Remove debug message

* Remove getTriState method

- No longer needed
- Remove associated unit tests

* Adjust filters based on server API version

* Muted colors

lib/widget/refreshable_state.dart

@@ -71,7 +71,7 @@ mixin BaseWidgetProperties {
    */
   BottomAppBar? buildBottomAppBar(BuildContext context, GlobalKey<ScaffoldState> key) {
 
-    const double iconSize = 32;
+    const double iconSize = 40;
 
     List<Widget> icons = [
       IconButton(
@@ -98,7 +98,7 @@ mixin BaseWidgetProperties {
         },
       ),
       IconButton(
-        icon: Icon(Icons.qr_code_scanner, color: COLOR_ACTION),
+        icon: Icon(Icons.barcode_reader, color: COLOR_ACTION),
         iconSize: iconSize,
         onPressed: () {
           if (InvenTreeAPI().checkConnection()) {