Ember - donation system, bans, loading screen & landing/index page

1. Implemented group colors
2. Updated the dependency checker

Files modified:

1. web/app/Controllers/MigrationController.php
2. web/app/Events/UserSaving.php
3. web/app/Models/Group.php
4. web/app/Models/User.php
5. web/bootstrap/app.php
6. web/composer.json
7. web/composer.lock
8. web/package-lock.json
9. web/package.json
10. web/public/js/app.js
11. web/public/mix-manifest.json
12. web/resources/js/components/ColorPicker.vue
13. web/resources/views/admin/groups.twig
14. web/resources/views/dependencycheck.twig
15. web/resources/views/landing.twig
16. web/resources/views/profile.twig
17. web/vendor/composer/autoload_psr4.php
18. web/vendor/composer/autoload_static.php
19. web/vendor/composer/installed.json
20. web/vendor/illuminate/events/CallQueuedListener.php
21. web/vendor/illuminate/events/Dispatcher.php
22. web/vendor/illuminate/events/EventServiceProvider.php
23. web/vendor/illuminate/events/LICENSE.md