User blocking (Following part) (#3035)

* block wip

* UndoBlock

* UnBlock

* wip

* follow

* UI

* fix

src/remote/activitypub/renderer/block.ts

@@ -0,0 +1,8 @@
+import config from '../../../config';
+import { ILocalUser, IRemoteUser } from "../../../models/user";
+
+export default (blocker?: ILocalUser, blockee?: IRemoteUser) => ({
+	type: 'Block',
+	actor: `${config.url}/users/${blocker._id}`,
+	object: blockee.uri
+});