+Full SR388 Metroid bestiary added.
+Event weights rebalanced
+Separated spiderlings from the infestation event.
+Added metroid infestation as a major random station event.
+Added boss fight as a major random station event.
+Added a new alarm sound for the metroid and boss events.
+Added ranged cooldown time and 'move and shoot' for the AI controlled xenomorphs.
