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Vaughn.Live Video Size Fix and Video Player Keyboard Shortcuts

Adds links to fix widescreen/letterbox videos (e.g. zoom letterboxed widescreen, unstretched letterbox, etc.; hover mouse cursor on links to show their description), and adds video player keyboard shortcuts: [Space] Play/pause, [M] Mute/unmute, [-] Decrease volume by 10%, [+]/[=] Increase volume by 10%, [F] Toggle fullscreen.