Colors and Images

• Fix color codes (#42)
  • Consistent naming for named foreground / background colors.
  • breaking change in Dots, Canvas and Figure: a color_kwargs argument is introduced to add kwargs to the color function.
    The color_mode argument is mode in most cases now.
• Improve rendering performance (#43)
• Images as binary braille dot in Canvas or heatmaps / images with background colors in Canvas / Figure
• CI now in Github