Handle video access error cleanly about camset HOT 2 CLOSED

Added a check for busy resource. It will now silently fail and not open the feed window if the resource is busy, and show a warning dialog if pressing the show feed button when the device is busy. Added to pip as version 0.0.6.

I'm keeping the default behavior of opening the feed window if there are no issues though, it's got to do with the GTK combobox - if there are multiple resources the video should change when changing the device, and when setting the default device in the combobox at start it counts as changing = whatever I want to occur when changing a device will also occur when starting the application (if setting a default device at start, which I prefer).

I did however notice some things I need to fix with the warning dialog after pushing this, will improve that another day.

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That's perfect! Just installed v0.0.6 and after changing the fourcc code (#2) it works like a charm 🥳

The default behavior is fine now - I open it up while Zoom has the feed and it doesn't try to open the video window or complain.

Love open source! Thanks again for your work on this 👊

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