Compiled in Java 20

Apparently this game would only run in Java 17, or at least not with Java 20.  So I installed JDK 20 and this build was compiled with JDK 20. Hopefully it will work if you download it.

I think I have just a few more minor bug fixes before this game is close to 100%. The AI may get stuck in a loop (I hope that is fixed! if not it's not super difficult to fix but i'm in burn out mode rn), which is the worst error that can happen, and there may still be a problem with the "double strike" maneuver for both PCs and AIs.

Besides these issues, the game should be fully playable and it's possible I already fixed them but testing all this is time consuming and I need a break from it!

The game may still not work if you don't have much RAM or you are running a 32 bit version of Java that requires heap space allocated to be contiguous in memory.