v Alpha.15 - Add Steam Overlay + First Achievement Test — Magic Sword Steam update #565402

This update might sound simple, but it was quite complex on the backend for me—getting the Steam overlay to work. You should now be able to press Shift+Tab and see the overlay, just like most other games on Steam. Please note, this currently only works on 64-bit Windows machines. Additionally, I’ve added a single test achievement, “First Payment,” to see if achievements are functioning correctly. During development, I couldn’t get the achievement status to show as "successful," but I’m curious if deploying it in production might make the Steam API behave differently and update the achievement as expected. Let’s see how it goes!