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/inventree/stock.dart

@@ -399,7 +399,7 @@ class InvenTreeStockItem extends InvenTreeModel {
 
     double get quantity => getDouble("quantity");
 
-    String quantityString({bool includeUnits = false}){
+    String quantityString({bool includeUnits = true}){
 
       String q = "";
 
@@ -467,7 +467,13 @@ class InvenTreeStockItem extends InvenTreeModel {
       if (serialNumber.isNotEmpty) {
         return "SN: $serialNumber";
       } else {
-        return simpleNumberString(quantity);
+        String q = simpleNumberString(quantity);
+
+        if (units.isNotEmpty) {
+          q += " ${units}";
+        }
+
+        return q;
       }
     }