core:image add support for option .flip_vertical #4826
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This is basically the same as the option in stb_image to flip an image. One common use case is loading images for OpenGL which expects pixel data to be upside down, unlike most other graphics APIs and image formats.
I'm not super sure if this is useful to most people, plus it's trivial to write yourself if you do need it, so no problem if you decide not to accept this PR just for irrelevance :)