ASCII Art paint release 7 Braille

Added function to export images to Braille.

Using the analysis of the original image, the algorithm matches dark and light pixels with eight dot Braille characters, This method better captures the contours and details of the original image and is suitable for high contrast images (like black and white manga comics).

This implementation uses Unicode characters (U2800 to U28FF) and is therefore incompatible with ASCII counterparts, and braille characters are missing in many fonts.