Embed: WebRTC improvements:

- make webrtc obey autoplay = false; when video is paused, disable autoplay and vise versa
- silenced some unneccesary webrtc errors
- webrtc: pause player on stop, so that "stream offline" message is shown
- improved webrtc wrapper robustness
- more webrtc don't autoplay when paused
- when not yet connected during a seek, wait until connected and seek then

embed/player.js

@@ -943,6 +943,7 @@ function MistVideo(streamName,options) {
             case "Stream status is invalid?!":
               if ((MistVideo.player) && (MistVideo.player.api) && (!MistVideo.player.api.paused)) {
                 //something is (still) playing
+                MistVideo.log(data.error,"error");
                 return;
               }
               buttons = {polling:true};