Minor update, June 8th

I had to release this patch early to deal with the fact that the first achievements became visible through Steam even before they were obtainable. But since I don't do fully modular updates, some of the other stuff I've been working on goes with it as well. [b]Feature updates[/b] [list] [*] AK-105 added [*] AK-105 with red dot sight added [*] RPG-7 added [*] Zoom levels somewhat reduced for the older/basic weapons (like the AK-74). The larger zoom levels should be reserved for future (more modern) weapons as they are added. [*] Preference setting to enable/disable zoom added (for those who want a challenge) [*] 4 achievements added/fixed (previously made visible prematurely my mistake) [*] One more defense mission added (featuring Russian artillery shelling) [*] AI slightly improved (they won't shoot friendlies quite as often - though it can (and should) still happen occasionally [/list] [b]Bugfixes[/b] [list] [*] Enemy moving/seeing/shooting through certain houses fixed [*] Reloading while switching weapon bug fixed [*] A few other minor details that have been fixed on the fly [/list]