Favorite tasks (#653)

Fixed namespace tests

Add test for favorite tasks

Fix favorite tasks not being updated

Fix integration tests

Fix lint

Return a pseudo namespace and list for favorites

Make sure users can only see their favorites

Add condition show tasks from the favorites list

Regenerate swagger docs

Add favorite field to task

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/653

pkg/db/fixtures/tasks.yml

@@ -8,6 +8,7 @@
   created: 2018-12-01 01:12:04
   updated: 2018-12-01 01:12:04
   bucket_id: 1
+  is_favorite: true
 - id: 2
   title: 'task #2 done'
   done: true
@@ -140,6 +141,7 @@
   list_id: 6
   index: 1
   bucket_id: 6
+  is_favorite: true
   created: 2018-12-01 01:12:04
   updated: 2018-12-01 01:12:04
 - id: 16
@@ -315,6 +317,7 @@
   list_id: 20
   index: 20
   bucket_id: 5
+  is_favorite: true
   created: 2018-12-01 01:12:04
   updated: 2018-12-01 01:12:04
 - id: 35