Add ability to draw filled triangle

include/rasteriser/rasteriser.h

@@ -21,6 +21,7 @@ typedef struct {
 
 void draw_wireframe_triangle(window_t *wnd, triangle_t triangle,
                              colour_t colour);
+void draw_filled_triangle(window_t *wnd, triangle_t triangle, colour_t colour);
 void draw_line(window_t *wnd, line_t line, colour_t colour);
 
 #endif // !RASTERISER_H