[Feature Request] MJPEG: Add flip option

[jmontane]

I am working on a DIY car HUD project and I found ScreenStream. It suits my needs, but there is no image flipping feature. So, I request that a "Flip" option be added, similar to the "Rotate" one. This "Flip" option should have 3 options: none, horizontally, and vertically. Could you please add this feature, please?

[dkrivoruchko]

Ok, will add.