imagequant

The only code changes made are

Change import paths to github.com/1lann/imagequant.
Use []byte as NewImage's rgba32data argument instead of string.
GoImageToRgba32 and Rgb8PaletteToGoImage are taken from cmd/gopngquant/main.go and replicated in Image.go such that it's available in the package.
Uses imagequant-sys from https://github.com/ImageOptim/libimagequant

Name		Name	Last commit message	Last commit date
Latest commit History 9 Commits
cmd/gopngquant		cmd/gopngquant
lib		lib
COPYRIGHT		COPYRIGHT
LICENSE		LICENSE
README.md		README.md
attributes.go		attributes.go
go.mod		go.mod
histogram.go		histogram.go
image.go		image.go
imagequant.go		imagequant.go
libimagequant.h		libimagequant.h
license.go		license.go
result.go		result.go

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