Optimize LodePNG#106

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woot000 wants to merge 10 commits intofhanau:masterfrom

Commits on Sep 11, 2022

Switch lodepng_compute_color_stats to void, other minor changes
woot000
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Commits on Sep 13, 2022

Commits on Sep 20, 2022

Replace exit() with return statements, minor edits
woot000
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Commits on Sep 24, 2022

Minor optimizations to encoding, formatting
woot000
committed