Fixes:
* Depot mobs now generate attack animations when you attack them.
* Depot mobs can no longer be endlessly spammed with melee item attacks. This counters the 'spam attacks till you get lucky' strategy.
* Depot mobs can no longer be harmed by punching them. This counters the 'bypass eshield with punches' strategy.
* Depot mobs will now kill you if you're in crit. This counters endlessly-regenerating diona.
* Syndicate sentry bot will now path through other depot mobs. This fixes the bot getting stuck on them.
Balance tweaks:
* Armory airlocks are now harder to hack.
* Armory is now protected by an energy shield. Killing officers may randomly unlock the shield. This counters people rushing the armory every time. Depot mobs can walk through the shield.
* Depot mobs (except for the bot) now recogize if you've returned from death to attack them again, and increase the alert level further. This counters changelings.
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