sdl2: fix retina mouse coordinates#822
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cxxxr merged 4 commits intolem-project:mainfrom Jul 7, 2023
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These methods take a raw (x,y) input (in pixels) from sdl2 and multiply
it by the dpi scale (usually 2 for retina screens, otherwise 1) and then
multiply that by the char-{width,height}.
Previously, retina resolution was added to lem for rendering its fonts. This accidentally skipped over doing the same scaling calculation for the mouse coordinates so we fix that here.
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Now that lem has nice retina fonts, let's also add the same for mouse events.