Add static blocking write function to gui. This allows us to set a updating... status on the display when starting the updater.

stm-firmware/main.c

@@ -162,6 +162,8 @@ static inline void handle_boot_status(void)
 		led_set(0, 1);
 		led_set(1, 1);
 
+		gui_lcd_write_direct_blocking(0, "Updating...");
+
 		start_updater_ram_code();
 	}