previewer: Implement start/stop behaviour #849
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Fixes #700
Fixes #812
Rework previewer behavior to have a start / stop flow and replace "open window" / "close window" with it.
See https://matrix.to/#/!kDBZrVKCdhrVuWxbGe:matrix.org/$sVy_i1xbrSFiuXYI1X1lMZn-tyu7VH02S_pwUQkp0GI