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An embedded-friendly PNG encoder

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I was experiencing corruption of the png when using addLine, but not when using addRGB565Line. I noticed they don't share code and they aren't identical, and copying the "good" code...

Hello. All is in the title, here are 3 images with their palette from example code: ![{0,0,0,0,255,0}](https://github.com/user-attachments/assets/1aecdd1a-ee55-4395-ad5c-5033218a26a9) ![{0,0,0,255,0,0}](https://github.com/user-attachments/assets/4fbeca19-1f79-4026-b057-12be1c242c08) ![{0,0,0,0,0,255}](https://github.com/user-attachments/assets/b13b486e-d786-46ce-a116-0e430d5153a0) Red is blue and blue is red. This is not documented...

Hello. First thanks a lot for your fancy library ! I encounter a strange bug on Raspberry Pi Pico when using PNGenc (same with two unrelated codes). I try to...