Fixed a bug with the group room, where videos froze on guest re-join
added &scene=0 (&scene) , which auto-adds videos to the scene without interaction
Updated the &mirror URL flag to have 0, 1, 2, and 3 as options.
-no mirror parameter in the URL is the default. Local previews are mirrored
-mirror=0 turns off ALL mirroring, for everything.
-mirror=1 inverts the default. Local previews are not mirrored, but guests are mirrored.
-mirror=2 mirrors ALL videos
-mirror=3 is the same as default, except the entire website is mirrored, including Text (useful for teleprompters?)
Experimental Code Change : When the data-channel closes, I auto-close the video channels as well, and try to reload the video from scratch. I do not wait for the video stream to time out. This *might* fix a 'stacking video' problem, as well as reducing the "frozen frame" video problem when a guest reloads.
This 10.2 release is currently on https://obs.ninja/beta for testing
