Module icy_sixel

Available on doc or test only.

icy_sixel modifications

(↑) This is derived work from the icy_sixel crate, (a Rust port of libsixel) including the following modifications:

• make it work with no_std.
• make it work without unsafe.
• make several functions const.
• rename sixel_dither to DitherConf.
• rename MethodForRep to SixelMean.
• rename DiffusionMethod to Dither.
• rename MethodForLargest to SixelSplit.
• rename BuiltinDither to SixelPalette, and associate the palettes.
• rename PaletteType to SixelColorModel and its ColorBox variant to Colors.
• add new methods to PixelFormat: bits_per_pixel, bytes_per_pixel, required_bytes.
• make private: SixelPalette, SixelNode, SixelOutput, SixelEncodePolicy, SixelColorModel, FormatType, many functions.
• new Sixel builder struct and make the sixel_string function private.
• derive Default and ConstDefault, when possible.
• rename many items according to rust guidelines.
• simplify lints, comments and attributes.
• improve docs, also for private items.
• improve and simplify error types.
• remove commented-out code.
• big refactor, modularize.