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

test/user_profile_test.dart

@@ -27,10 +27,8 @@ void main() {
 
     // Now, create one!
     bool result = await UserProfileDBManager().addProfile(UserProfile(
-      name: "Test Profile",
-      username: "testuser",
-      password: "testpassword""",
-      server: "http://localhost:12345",
+      name: testServerName,
+      server: testServerAddress,
       selected: true,
     ));
 
@@ -62,20 +60,15 @@ void main() {
     test("Add Invalid Profiles", () async {
       // Add a profile with missing data
       bool result = await UserProfileDBManager().addProfile(
-        UserProfile(
-          username: "what",
-          password: "why",
-        )
+        UserProfile()
       );
 
       expect(result, equals(false));
 
-      // Add a profile with a name that already exists
+      // Add a profile with a new name
       result = await UserProfileDBManager().addProfile(
         UserProfile(
-          name: "Test Profile",
-          username: "xyz",
-          password: "hunter42",
+          name: "Another Test Profile",
         )
       );
 
@@ -84,14 +77,14 @@ void main() {
       // Check that the number of protocols available is still the same
       var profiles = await UserProfileDBManager().getAllProfiles();
 
-      expect(profiles.length, equals(1));
+      expect(profiles.length, equals(2));
     });
 
     test("Profile Name Check", () async {
       bool result = await UserProfileDBManager().profileNameExists("doesnotexist");
       expect(result, equals(false));
 
-      result = await UserProfileDBManager().profileNameExists("Test Profile");
+      result = await UserProfileDBManager().profileNameExists("Test Server");
       expect(result, equals(true));
     });
 
@@ -104,23 +97,16 @@ void main() {
       if (prf != null) {
         UserProfile p = prf;
 
-        expect(p.name, equals("Test Profile"));
-        expect(p.username, equals("testuser"));
-        expect(p.password, equals("testpassword"));
-        expect(p.server, equals("http://localhost:12345"));
+        expect(p.name, equals(testServerName));
+        expect(p.server, equals(testServerAddress));
 
-        expect(p.toString(), equals("<${p.key}> Test Profile : http://localhost:12345 - testuser:testpassword"));
+        expect(p.toString(), equals("<${p.key}> Test Server : http://localhost:8000/"));
 
         // Test that we can update the profile
         p.name = "different name";
 
         bool result = await UserProfileDBManager().updateProfile(p);
         expect(result, equals(true));
-
-        // Trying to update with an invalid value will fail!
-        p.password = "";
-        result = await UserProfileDBManager().updateProfile(p);
-        expect(result, equals(false));
       }
     });
   });