Add a UI element to the video player to change the player orientation to right sided

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Describe the feature request

Sometimes I watch YouTube while laying down and I turn to the other side. It’d be convenient to have a button to flip the player around as well.

Basically a button to flip the video vertically/orient to right side.

This was previously requested in #29 in August last year. But it was closed as the tweak was smaller and the scope had not expanded to what it is now.

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#29