PNG support

It allows you to decode a PNG file (including alpha channel).

Also modifies display.blit() to accept image data with an alpha channel. Introduces an RGB5551 format for RGB data with a single alpha bit.

added 2 commits

• a8cdee86 - feat(png): add lodepng library
• 294627cf - feat(mp): Add png support

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Looks good to me! Thanks for keeping our codebase clean.

However, I'm only a bot - so a human will still have to approve this request.

added 2 commits

• 2acbd18c - change(png): Change from 565+alpha to RGB5551
• 191498cc - change(blit): Allow to blit images with alpha channel

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changed the description

added 1 commit

• 17f6478a - change(blit): Allow to blit images with alpha channel

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merged

mentioned in commit cd98e490