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

.github/workflows/ci.yaml

@@ -18,9 +18,6 @@ env:
   INVENTREE_ADMIN_USER: testuser
   INVENTREE_ADMIN_PASSWORD: testpassword
   INVENTREE_ADMIN_EMAIL: test@test.com
-  INVENTREE_PYTHON_TEST_SERVER: http://localhost:12345
-  INVENTREE_PYTHON_TEST_USERNAME: testuser
-  INVENTREE_PYTHON_TEST_PASSWORD: testpassword
 jobs:
 
   test:
@@ -64,7 +61,7 @@ jobs:
           invoke install
           invoke migrate
           invoke import-fixtures
-          invoke server -a 127.0.0.1:12345 &
+          invoke server -a 127.0.0.1:8000 &
           invoke wait
           sleep 30
       - name: Unit Tests