'braille' render style

[AnonymouX47]

Branches off #57

This render style is based on three major things:

• Unicode braille patterns (+U2800 to +U28FF)
• Lightness of an image pixel

Progress:

• Sizing
• Rendering
• CLI integration
• TUI integration

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Initial idea

• The image is resized to a resolution of two pixels per cell.
• There are 5 levels of value (greyness), 0 to 4, each represented by the same number of dots.
• Each pixel maps to an integer which is an inclusive-OR combination of the bits representing each dot, based on this numbering:

• The integers for the two pixels in each cell are OR-ed to get an integer for the cell.
• The integers are stored in an array, whose size is the rendered size of the image.
  • For this, I'm plan to use array.array with 8-bit integers for better memory management.
  • The pixels will be iterated over in a flattened row-major order, while mapping each pixel to the corresponding array index.
• The integers are then converted to the code points for the corresponding symbol.
  • Zeros will be represented by blanks instead of +U2800 (saves a few bytes per occurrence 🌚)

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Any suggestions are always welcome. 😃