Technical update, apart from the Stormtroopers bug fix (which also slightly increases the pace of the ground combat as a side effect) the rest of the changes do not affect gameplay. It basically address some rare issues affecting a very minor portion of players. Also, as of this version, you should never need to run the game in safe_mode (but of course I'm keeping this option, just in case).

- [misc] Engine updated to the newest version (includes some fixes for some rare OS related issues).

- [fix] Memory related fixes (not critical, never reported to cause problems) and some paranoia checks & safeguards added.
- [fix] Stormtroopers being recalled too early. Also, as a side effect of removing the bug, now the ground invasion is a bit faster on average.