Add support for block apps from accessing the internet

[safwannayeem569]

I do not know if this is possible to achieve this feature without major rewrite of the app's core architecture. But it would be really nice. First time when I opened the app, I saw apps tab at the bottom. But after selecting it, I was not expecting bypassing domain filtering at all. It would be really nice if there were a firewall tab where you could block some app's internet traffic access entirely. An example app that implements just the firewall feature would be De1984. I would prefer having one app that does both of these. Hope to see it implemented. Happy holidays everyone, Cheers!