Animated PNG (APNG) read support#252

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randy408 wants to merge 9 commits intomasterfrom

Commits on May 31, 2023

meson: tests now require APNG support in libpng
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Commits on Jun 12, 2023

docs: tests now require apng support in libpng [skip-ci]
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Commits on Jun 19, 2023

docs: add 'setup' command for meson builds [skip-ci]
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Commits on Sep 12, 2023

add test images
randy408
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