Added a host-mode

- Fullscreen video + playlist
- Removed fullscreenbutton in host-mode
- Removed skip-button in host-mode
- Disabled skipping in host-mode
- Removed buttons and rightclick menus in host-mode
- Host mode for easily having a computer playing at a party without being able to modifying the currently playing video/song

server/public/assets/js/channel.js

@@ -435,6 +435,9 @@ var Channel = {
 
     add_context_menu: function() {
         addListener("contextmenu", ".vote-container", function(e) {
+            if(hostMode) {
+                return;
+            }
             this.preventDefault();
             this.preventDefault();
             var that = this;