Move video.rs into its own module

src/state.rs

@@ -1,7 +1,6 @@
-use crate::video::{PlaylistGenerator, VideoPlaylistManager};
-use crate::StreamActor;
 use actix::{Actor, Addr};
 use std::{env, sync::Arc};
+use crate::video::actors::{PlaylistGenerator, StreamActor, VideoPlaylistManager};
 
 pub struct AppState {
     pub stream_manager: Arc<Addr<StreamActor>>,