Only redraw block when necessary
Only redraw block when necessary

To improve performance, the color of each 'pixel' is stored in a map.
Redraws are only made when that color changes.

theGeekPirate/termboy-go,dobyrch/termboy-go,theGeekPirate/termboy-go,dobyrch/termboy-go,dobyrch/termboy-go,theGeekPirate/termboy-go