Fixed line and circle drawing code in Window. But it looks bad ans some form of dithering is definitely required.

include/Window.h

@@ -4,6 +4,8 @@
 #include "prototypes.h"
 
 class Window {
+private:
+	void _circle_point(int x0, int y0, int x1, int y1, CRGB* color);
 public:
 	const uint8_t x, y;
 	const uint8_t width, height;