Modified server deletion to use internal event handlers from the
Eloquent models themselves. Also added a few preliminary event handlers
in the `Pterodactyl\Events\<USer|Server> namespace that users can hook
into in EventServiceProvider to perform their own actions as they
please (such as push notifications and such).
This action allows servers to be deleted, but only be soft-deleted for
10 minutes. After that time period the server will be completely
removed from the database and daemon. This allows some safety if a
server is accidentally deleted.
Force deleting a server will still work. If the daemon is in-accessible
the server will fail to be deleted. When server is soft-deleted admins
can still view its information page in the admin CP, however the server
will be suspended and inaccessible on the front-end or though the
daemon.
Admins can manually delete the server ahead of the delete timer, or if
it failed to delete previously they can do an immediate retry.
