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

• Implemented group colors
• Updated the dependency checker

Files modified:

• web/app/Controllers/MigrationController.php
• web/app/Events/UserSaving.php
• web/app/Models/Group.php
• web/app/Models/User.php
• web/bootstrap/app.php
• web/composer.json
• web/composer.lock
• web/package-lock.json
• web/package.json
• web/public/js/app.js
• web/public/mix-manifest.json
• web/resources/js/components/ColorPicker.vue
• web/resources/views/admin/groups.twig
• web/resources/views/dependencycheck.twig
• web/resources/views/landing.twig
• web/resources/views/profile.twig
• web/vendor/composer/autoload_psr4.php
• web/vendor/composer/autoload_static.php
• web/vendor/composer/installed.json
• web/vendor/illuminate/events/CallQueuedListener.php
• web/vendor/illuminate/events/Dispatcher.php
• web/vendor/illuminate/events/EventServiceProvider.php
• web/vendor/illuminate/events/LICENSE.md