VideoManager: Fix GStreamer & UVC Setup #11552
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VideoManager had some issues that this addresses. For example, you could not use a UVC device without gstreamer being enabled despite the fact that UVC doesn't use gstreamer. Also the handling of multiple video receivers was never finished and this resolves some of the unfinished work. One particular issue is that the entire video manager was essentially disabled without gstreamer, which makes it impossible to use for custom builds that provide a video sink from a different source (They could override the VideoManager but that is unecessary). This should be handled before my other QtMultimedia PR.