Show caret, backspace, and left-right arrows

builtins.ts

@@ -54,10 +54,15 @@ const drawText = (x: number, y: number, text: string) => {
 	});
 }
 
+const drawRect = (x: number, y: number, w: number, h: number, color: number) => {
+	setPixelsInRect(x, y, w, Array(w*h).fill(color));
+}
+
 const faux = {
 	clear_screen: clearScreen,
 	draw_sprite: drawSprite,
 	draw_text: drawText,
+	draw_rect: drawRect,
 	key_down: keyDown,
 	key_pressed: keyPressed,
 	key_released: keyReleased,