Fix and optimize clipping behavior for gfx_HorizLine and gfx_VertLine #678
+199
−44
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Fixes #673, verified fix against FishCE and using a new test program.
Also, as a behavioral fix compared to before the clipping logic was broken, signed overflow of start + length is handled as if saturated (so negative lengths are never drawn, and positive lengths causing an overflow past INT_MAX will be drawn all the way to the right of the clip region).