Bug Fix patch with plugin working update

• Changed plugin settings to activate and deactivate plugin by removing the update process for the config/app.php file.
• Changed plugin ServiceProvider registration technique by removing the hard-coded code AppServiceProvider.php file. Now We are registering all plugins' ServiceProvider classes available for active plugins with status as 1 in plugins table in the database. It provides more dynamicity to developers so they need not worry about registering their custom plugin's ServiceProvider.
• Added new event "after.ticket.created" which gets fired after tickets get created and contain ticket data. It can be useful for developers for creating new plugins which need to perform a certain action after the ticket is created.
• Updated helpers.php added new method carbon() to parse string date into carbon date object.
• Added Spanish language translation (translates system up to 60% in Spanish)
• Forget password validation exception removed dd() statement
• Updated isInstall() method get installation value from Config instead of directly calling from .env
• SLA deletion issue fixed #714
• Updates for Plugin working