8.2 Indirect Fire fixed

Uploaded version 8.2.

• Finally Idirect Fire works as intended.

...but no as in the book. No spotter is required, you just get a +2 penalty.

• You can use it, and AI does not shoot through buildings if it does not have the ability.

Also started optimizing everything. Managed to get +2 FPS so far, but I know what to do next.