New feature for channel hosts: warn and hide

- Send an in-app notification on Warpcast (not public, not push) to the the user directly them to your channel's norms

- We renamed Hide to Hide quietly for instances where you don't want to warn.

- Ban from channel remains unchanged

Dan - Quick question, will there be the ability to upload videos as part of a cast directly in the coming weeks? I have so much video media I can get online from our organization that will help provide some really great content for people.