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

stm-firmware/ui/gui.c

@@ -842,3 +842,14 @@ void gui_root_menu_message_set(const char *heading, const char *text)
 		strcpy(overlay_text, text);
 	}
 }
+
+void gui_lcd_write_direct_blocking(uint8_t line, const char *text)
+{
+	if (!text)
+		return;
+	if (line > 3)
+		return;
+
+	lcd_setcursor(0, line);
+	lcd_string(text);
+}