[Bug] - Fix broken installation GUI.
[Bug] - Fix installer TemplateEngine render issue.
[Bug] - Fix error handling on save and delete entities.
[Bug] - Fix Administration panel filters are not working.
[Core] - Add new column for select multiple entries in the administration panel and include a mass-delete option.
[Core] - Include users alert and notification for maintenence down time.
[Core] - Add flash messages for admin actions results.
[Core] - Include events on administration panel routes.