Token auth (#434)

* Embed device platform information into token request

* Remove username and password from userProfile

* Display icon to show if profile has associated user token

* Remove username / password from login settings screen

* Refactor login procedure around token auth

* Refactoring

* Add profile login screen

- Username / password values are not stored
- Just to fetch api token

* Login with basic auth

* Pass profile to API when connecting

* Remove _BASE_URL accessor

- Fixes URL caching bug

* Add more context to login screen

* Add helper functions for unit tests

- Change default port to 8000 (makes testing easier with local inventree instance)

* api.dart handles basic auth now

* fix api_test.dart

* Further test improvements

* linting fixes

* Provide feedback when login fails

* More linting

* Record user details on login, and display in "about" widget

* Fix string lookup

* Add extra debug

* Fix auth values

* Fix user profile test

lib/widget/home.dart

@@ -8,7 +8,7 @@ import "package:inventree/api.dart";
 import "package:inventree/app_colors.dart";
 import "package:inventree/preferences.dart";
 import "package:inventree/l10.dart";
-import "package:inventree/settings/login.dart";
+import "package:inventree/settings/select_server.dart";
 import "package:inventree/user_profile.dart";
 
 import "package:inventree/widget/category_display.dart";
@@ -119,7 +119,7 @@ class _InvenTreeHomePageState extends State<InvenTreeHomePage> with BaseWidgetPr
 
   void _selectProfile() {
     Navigator.push(
-        context, MaterialPageRoute(builder: (context) => InvenTreeLoginSettingsWidget())
+        context, MaterialPageRoute(builder: (context) => InvenTreeSelectServerWidget())
     ).then((context) {
       // Once we return
       _loadProfile();
@@ -147,7 +147,7 @@ class _InvenTreeHomePageState extends State<InvenTreeHomePage> with BaseWidgetPr
       if (!InvenTreeAPI().isConnected() && !InvenTreeAPI().isConnecting()) {
 
         // Attempt server connection
-        InvenTreeAPI().connectToServer().then((result) {
+        InvenTreeAPI().connectToServer(_profile!).then((result) {
           if (mounted) {
             setState(() {});
           }