List refactor (#179)

* Catch paginator bug if widget is disposed before request returns

* Refactoring paginated query widget

- Add option to enable / disable search filters

* Major refactor of paginated search widget

- Learned something new.. a state can access widget.<attribute>
- THIS CHANGES EVERTHING

* Preferences: Add code for tri-state values

- Also improve unit testing for preferences code

* Allow boolean form fields to be optionally tristate

* paginator: Allow custom boolean filters

* Remove outdated filtering preferences

* Refactor filter options

- Allow specification of more detailed options

* Add custom filters for "part" list

* filter tweaks

* Remove legacy "SublocationList" widget

* Add filtering option for locationlist

* Updates for stock location widget

* Refactor category display widget

* More widget refactoring

* Update main search widget

* Fix unit tests

* Improve filtering on BOM display page

lib/l10n/app_en.arb

@@ -297,6 +297,48 @@
   "feedbackSuccess": "Feedback submitted",
   "@feedbackSuccess": {},
 
+  "filterActive": "Active",
+  "@filterActive": {},
+
+  "filterActiveDetail": "Show active parts",
+  "@filterActiveDetail": {},
+
+  "filterAssembly": "Assembled",
+  "@filterAssembly": {},
+
+  "filterAssemblyDetail": "Show assembled parts",
+  "@filterAssemblyDetail": {},
+
+  "filterComponent": "Component",
+  "@filterComponent": {},
+
+  "filterComponentDetail": "Show component parts",
+  "@filterComponentDetail": {},
+
+  "filterInStock": "In Stock",
+  "@filterInStock": {},
+
+  "filterInStockDetail": "Show parts which have stock",
+  "@filterInStockDetail": {},
+
+  "filterSerialized": "Serialized",
+  "@filterSerialized": {},
+
+  "filterSerializedDetail": "Show serialized stock items",
+  "@filterSerializedDetail": {},
+
+  "filterTemplate": "Template",
+  "@filterTemplate": {},
+
+  "filterTemplateDetail": "Show template parts",
+  "@filterTemplateDetail": {},
+
+  "filterVirtual": "Virtual",
+  "@filterVirtual": {},
+
+  "filterVirtualDetail": "Show virtual parts",
+  "@filterVirtualDetail": {},
+
   "filteringOptions": "Filtering Options",
   "@filteringOptions": {},
 
@@ -368,13 +410,13 @@
   "includeSubcategories": "Include Subcategories",
   "@includeSubcategories": {},
 
-  "includeSubcategoriesDetail": "Display subcategory parts in list view",
+  "includeSubcategoriesDetail": "Show results from subcategories",
   "@includeSubcategoriesDetail": {},
 
   "includeSublocations": "Include Sublocations",
   "@includeSublocations": {},
 
-  "includeSublocationsDetail": "Display sublocation items in list view",
+  "includeSublocationsDetail": "Show results from sublocations",
   "@includeSublocationsDetail": {},
 
   "incompleteDetails": "Incomplete profile details",