Changed Deathstorm drop pod model to SM HQ (still can't find drop pod model that I could use :()

-Bugfix on some icons not appearing
-Added new trait to Hammerfall Bunker and Deathstorm Drop Pod: Automated Sentry, which decreases attacks of those units by 75%.
-Tweaked Defensive Array Trait to additive 125% bonus attacks when overwatching (total: 1-0.75+1.25=1.5 times normal attack amount after taking into account automated sentry trait). Also reduces range of all weapons by 1 when overwatching.