Modern attachments (#505)

* Minimum API version is now 100

* Remove old API features

- Anything below API v100 no longer supported

* Reefactor attachment widget to support modern attachment API

* Filter and display attachments correctly

* Refactor

lib/settings/about.dart

@@ -121,15 +121,13 @@ class InvenTreeAboutWidget extends StatelessWidget {
       );
 
       // Display extra tile if the server supports plugins
-      if (InvenTreeAPI().pluginsEnabled) {
-        tiles.add(
-          ListTile(
-            title: Text(L10().pluginSupport),
-            subtitle: Text(L10().pluginSupportDetail),
-            leading: FaIcon(FontAwesomeIcons.plug),
-          )
-        );
-      }
+      tiles.add(
+        ListTile(
+          title: Text(L10().pluginSupport),
+          subtitle: Text(L10().pluginSupportDetail),
+          leading: FaIcon(FontAwesomeIcons.plug),
+        )
+      );
 
     } else {
       tiles.add(