Implement panel rotation HAL and crisp canvas rotation #22
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This makes the API symmetric with `lv_img_buf_alloc`. For our use-case, it's fine since we're not intending to use manually managed buffers or "program data" as a buffer. We're working on top of a full operating system. If dealing with a buffer manually ends-up being needed, we can add some escape hatch.
This ensures pixels are crisp. Otherwise the antialiased rotation handling will massacre your crisp images.
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Needed for BGRT rotation support.